MCB251 Evaluation Board
Contents
1. load mon251 dll This is shown in the following figure Command COPYRIGHT KEIL ELEKTRONIK GmbH 1996 gt load mon251 d11 MON251 Driver for dScope Windows V1 06 Keil MCB251 Board V2 Non Page Mode MCS 251 Source Mode Interrupt FrameSize 4 gt Idos ASM ASSIGN BreakDisable BreakEnable TAB INS 4 44 Chapter 4 Programming Typically the first time you load the CPU driver for the 251 monitor you must set the COM port and baud rate If dScope cannot determine the COM port and the baud rate automatically the following dialog box appears informing you that dScope could not find the target system TARGET SYSTEM NOT FOUND Please check the settings and your target system Port com 2 d ech H When using the MCB251 evaluation board the baud rate should be set for 57 600 baud You must determine which COM port you use Next you should configure the CPU driver to enable serial breaks To do this select the Configuration command from the Peripherals menu dScope displays the Configuration dialog box shown below Port settings gt Port COM 2 y Apply Baudrate 57600 ER Set Enable serial break to let dScope stop programs running on the MCB251 Previous S Cact Target configuration is VE I Warm start user program Close F data F xdata F code F idata Finallv vou are readv to load the BLINKX program To2. s Guide Chapter 1 Introduction Thank you for letting Keil Software provide you with the MCB251 evaluation board and software for the MCS 251 microcontroller family With this kit you can generate code and then operate it on the MCB251 evaluation board This hands on process helps you determine hardware and software needs for current and future product development The MCB251 evaluation board supports all operating modes of the 8051 151 and 251 microcontrollers and lets you become familiar with the different modes of these devices You may use a standard 8051 or the Dallas Semiconductor 80C320 or 8xC520 with this board By generating and testing code for the various operating modes of the 8051 151 and 251 you can evaluate code and processor performance These factors can be weighed against other production parameters to help you choose the optimum code and processor combination Alternatively you may choose just to play with the board make it flash the LEDs and write Hello World out the serial port This user s guide describes the hardware of the MCB251 evaluation board and contains the operating instructions for the monitor programs MON251 MONS 1 and the terminal programs MON251 EXE MONS1 EXE Several different configurations of Monitor 251 and Monitor 51 are installed in the EPROM on the MCB251 board The monitor programs let you communicate between your PC and the MCB251 evaluation board and let you download and run yo
3. 10 for a complete description on how to select the CPU type and the related Monitor version If you operate the MCB251 with a user application in EPROM you must set the SRC DP2 switch to OFF MCB251 Evaluation Board User s Guide PAGE Default OFF The PAGE switch selects whether or not the 251 or 151 Monitor operates in page mode or non page mode When PAGE is ON a page mode Monitor version is selected When PAGE is OFF a non page mode Monitor version is enabled For correct operation of the MCB251 board you must also set the configuration jumpers to the correct position PAGE for page mode or NONP for non page mode If you operate the MCB251 with a user application in EPROM you must set the PAGE switch OFF However you may still use the jumpers to select page mode or non page mode Monitor Default ON The Monitor switch selects if the Monitor is used for debugging or if the MCB251 operates with a user application EPROM at IC13 When Monitor is ON the Monitor Memory Mapping is enabled and you must operate the MCB251 board with the supplied Monitor EPROM When Monitor is OFF the User Memory Mapping is selected and you may insert an EPROM with your target application If you operate the MCB251 with a user application EPROM you must set the DIP switches 51 151 PAGE and SRC D2 to OFF 51 151 Default ON The 51 151 switch selects whether a 251 or a 151 8051 compatible microcontroller is installed in the ICI socket If a 151
4. Evaluation Board User s Guide Monitor Modes ON use ext RS232 57600bps OFF use int RS232 19200bps ON LED s display Port 1 Status OFF LED s off Monitor ON use Monitor for Debugging OFF User EPROM see table Memory Map Monitor Selection Monitor ON be eral r OFF 8051 Bus OFF Binary Mode i jw Sor NON JE apo JMAPtJRIM RAM Orr DFr ow om frz 192KB 0 O2HFF ON JOFF 12848 om noer 126K8 op 224kB 008000 00FFFF ore ja FDO000 FFFrFF s 22KB 0 007FFF N 8051 Mode 8051 Mode 64K8 C0 CFFFF Sep X0 XDFFF pi Memory Map excludes USER amp UART areas XE000 XE3FF XE amp 00 XETFF 4HC373 Projekt cb251sb 6 12 07 96 I 10 10 11 19 Chapter 3 Hardware 20 IBNI WS LOOLILZ MCB251 Evaluation Board User s Guide Ge Ale P a 9 a SE e EE Za SES Kess ECH p yg O Fg en i p a7 Microcontroller Board Name Keil BI Km PI rojekt mch251sb 6 Datum 1207 96 10 10 11 Page 2 AAA AA N 21 22 Chapter 3 Hardware Printed Board Assembly V42254 B2200 R960 DB1 DB7 DB6 DBO DB7 HYALOS Di OZ UDISJSA LSZJIJW Ayo NS ei S
5. NMI pin on the Temic 251G1 If NMI is ON pin 34 is connected to GND INT1 Default ON The INT1 configuration jumper selects whether or not the INT push button is connected to port pin 3 3 on the microcontroller If the INT1 switch is ON the INT push button is connected to port 3 3 If INT1 is OFF the INT push button is not connected to port 3 3 PAGE NONP Default NONP These nine configuration jumpers select whether the MCB251 board operates in page mode or non page mode When these jumpers are in the PAGE position the address data bus is configured for 251 151 page mode When the jumpers are in the NONP position the standard 8051 bus or 251 151 non page mode is selected In page mode the data and upper address byte are multiplexed on port 2 this mode is available only on the 251 151 In non page mode the data and lower address byte are multiplexed on port 0 this mode is available on the 251 151 and 8051 This jumper setting should be set to coincide with the CPU CONFIG BYTE settings Refer to the 25 or 151 Microcontroller User s Manual for more information about these modes 10 Chapter 2 Setup CPU Selection The MCB251 board can operate with various CPU types The following table gives you an overview of the various CPU operating modes It lists values for the configuration bytes of the 251 151 CPU used by the Monitor program For more information about the configuration registers refer to the 25 or 151 Microco
6. S1 is connected to the reset input of the CPU The second button labeled INT S2 is connected to the INT1 port 3 3 of the CPU when the configuration jumper INT1 J5 is set When the configuration jumper NMI is not set you may generate an NMI signal to the Temic 251G1 device Serial Port The MCB251 supports both the on chip serial port and an external UART Both use the MAX232 at IC10 to convert TTL to RS 232 voltage levels You can configure the Monitor to use either the on chip serial port or the external UART for the communication with the PC When the ext Uart DIP switch is ON the external UART is used at 57600 BPS for the Monitor communication Otherwise the on chip serial port is used at 19200 BPS for the Monitor communication The internal serial port is derived from the internal serial functions of the 8051 251 P3 0 RXD and P3 1 TXD The external UART IC5 is implemented using an 8250 16450 or 16550 device This is the same chip that is used in most PCs A 1 8432 MHz oscillator provides the input frequency to the UART The interrupt output of the UART is optionally connected to the INTO pin port 3 2 of the CPU When the Uart INT DIP switch is ON the UART interrupt is connected to the INTO CPU pin MCB251 Evaluation Board User s Guide 17 Both serial ports are configured as a RO 87 SN i standard 3 wire interface The handshaking l ASAS signals are connected to loop the PC s RTs BO TxD jo Me signals bac
7. Switch is ON Map1 Mapp RAM Monitor EPROM UART CS amp USER CS OFF OFF 00 0000h 01 FFFFh FF E800h FF FFFFh UART FF E400h FF E7FFh 251 Mode FE 0000h FF DFFFh USER FF E000h FF E3FFh OFF ON illegal illegal illegal ON OFF illegal illegal illegal ON ON X 0000h X DFFFh C E800h C FFFFh UART X E400h X E7FFh 8051 Mode C 0000h C DFFFh USER X E000h X E3FFh von Neumann mapped von Neumann mapped The 251 CPU provided with the MCB251 evaluation board is programmed so that the RD signal provides the A16 address line This lets the 251 address up to 256K of external address space The memory mapping during the test phase allows you to use the maximum address space of that CPU 28 Chapter 4 Programming Monitor Data amp Interrupt Vectors The Monitors provided with the MCB251 use a minimal amount of your target s resources The following sections describe what is required for the 251 monitor and for the 8051 monitor Monitor 251 For debugging the 251 monitor uses the TRAP interrupt vector of the 251 CPU for handling breakpoints In addition you can enable the serial interrupt so that you can use dScope to halt a program that is running The Temic 251G1 allows you to stop program execution with the NMI interrupt The interrupt vector addresses listed in the following table should not be used by the application under test The 251 monitor uses the address space OxFFDFCO OxFFDFFF for monitor data The user application sho
8. X E400h X E7FFh 8051 Mode C 0000h C DFFFh USER X E000h X E3FFh von Neumann mapped von Neumann mapped User Memory Mapping Monitor DIP Switch is OFF Note DIP Switch 51 151 Page and SRC D2 must be also OFF Mapi Map0 RAM User EPROM UART CS amp USER CS OFF OFF 00 0000h 01 FFFFh FF 0000h FF DFFFh UART FF E400h FF E7FFh 251 Mode FE 0000h FE FFFFh FF E800h FF FFFFh USER FF E000h FF ESFFh OFF ON 00 0000h 01 FFFFh FE 0000h FF DFFFh UART FF E400h FF E7FFh 251 Mode FF E800h FF FFFFh USER FF E000h FF ESFFh ON OFF 00 0000h 00 7FFFh 00 8000h 01 FFFFh UART FF E400h FF E7FFh 251 Mode FE 0000h FF DFFFh USER FF E000h FF E3FFh FF E800h FF FFFFh ON ON X 0000h X DFFFh C 0000h C FFFFh UART X E400h X E7FFh 8051 Mode USER X E000h X E3FFh LED Default ON The LED switch selects whether or not Port 1 is connected to the 8 LEDs in the upper right portion of the board When LED is ON the LEDs on port 1 are enabled When LED is OFF the LEDs are not connected to port 1 If the Monitor DIP switch ON and LED is OFF the Monitor does not modify the port lines on power up MCB251 Evaluation Board User s Guide Configuration Jumpers The following sections describe each of the configuration jumpers of the MCB251 board NMI Default ON The NMI configuration jumper selects whether or not the INT push button is connected to the NMI pin on the Temic 251G1 microcontroller If NMI is OFF the INT push button is connected to the
9. enter a file where the contents of the screen will be copied For example Output File DEBUG PRN directs MON251 to write the screen contents to DEBUG PRN Press F3 or Alt 3 to stop writing screen changes If you enter the name of a file that already exists MON251 responds with the following prompt Overwrite existing file y or n Enter Y to overwrite the file HELP Display the Help Menu When you enter the help command MON251 displays a brief description of all 251 monitor commands Comment Lines Any line starting with a semicolon is a comment Comments may be entered after a command For example D C 0x4000 Show code at 0xFF4000 MON251 ignores any text after the semicolon Comments are useful when you use F2 to transmit the contents of a command file MCB251 Evaluation Board User s Guide Index E BEEN iss sone cioe see ed 46 Example Program IST CPU tances 6 External UART 46 DON 8 ise Uii 15 FLASH steiere Sea Se 31 291 CPU 2 ta TE 14 ext_Uart DIP Switch 6 251 Monitor 49 External UART Example 51 151 DIP Switch 7 Program z aene ees 46 SOM CPU sedo tie 6 14 F A FLASH E xample Program 31 A17 DIP Switch eee eennnenenzznenn 7 H B Hardware 13 BAUDRAJE si ekg vedi Sb iii 50 Hardware Requirements 3 BR ute aee bon 50 Buttress ces essei etes erii 15 I C VO KEE 15 INTI Jumper eet 9 Circuit Description 13 INTA tana
10. equations used Memory and I O Devices The MCB251 maps three memory devices into the address space of the CPU the RAM at IC14 the RAM at IC15 and the EPROM at IC13 The 20V8 PAL at IC12 provides the chip select signal for the external UART at ICS and a user chip select signal The MCB251 board comes with a Monitor EPROM at IC13 which can support up to 16 different Monitor versions You may replace the Monitor EPROM at IC14 with a 27C1001 or 27C2001 for your target program If you insert an EPROM with a user application program the DIP switches PAGE SCR D2 51 151 and Monitor must be set to OFF If the Monitor DIP switch is OFF you may select different memory maps for the user application using the MAPO and MAPI DIP switches For more information refer to the MAP1 and MAPO DIP switch descriptions on page 7 16 Chapter 3 Hardware Status LEDs The MCB251 has a single power LED labeled ON which indicates the power to the board is on Eight LEDs are optionally connected to the Port 1 outputs through a 74HC373 at IC3 The Port 1 LEDs are flashed during reset and display the configuration status of the Monitor EPROM For more information refer to Monitor Status Display on page 11 You may disable the LED driver by setting the LED DIP switch OFF The this DIP switch is OFF the Monitor does not affect the Port 1 Pins during the reset phase Push Buttons The MCB251 provides two push buttons The first push button labeled RESET
11. geese Re 50 COMPE Sie te het Ain 50 Intel 151 LL esse 14 ca 50 Intel 251SB 5 eee 14 COMI deu a o iot n 50 Jotroducton sssenneneeoneneosesoseesosersreesese 1 COMA tee leon e 50 Configuration nn 14 K Configuration Jumpers 9 T een Configuring the MCB251SB 5 Kit Contents eee 1 Contents of MCB251SB Kit 1 CPU Selection sessi aad 10 L LED DIP Switch ss semeennenenzzennzni 8 D Dallas 320 no e 6 14 M Dallas 520 IS ntet 6 MAP DIP Switch ss 8 EE P EE Ee 16 DIP Switch Memory Device seseenssnsnennnzzzzni 15 A TV Default Settings ss sseseeeeeeeeeeeeee 5 MON251 wa 5 C l omment Lines sss neosesesens0seee00e 52 DIP Switches id E 6 Exit Command ida aiea 51 Document conventions iv Pi Command ee Mi Win n 51 F2 Commande 51 F3 Command ess 52 54 Help Command 52 Terminal Commands 51 MONO51 environment variable 50 MON251 Terminal Program 49 Monitor Data Space 28 Monitor DIP Switch 7 Monitor EPROM Addresses 26 Monitor Interrupt Vectors 28 Monitor Memory Map 27 Monitor Modes sess 11 Monitor Program nn 49 Monitor Status Display 11 N NMI Jumper 9 NOIN T aee eee 50 P PAGE NONP
12. gt gt 8 amp OxFF EXTSIO_LCR lcr save Restore LCR MCB251 Evaluation Board User s Guide 47 This function performs a general initialization of the external UART on the MCB251 void extsio_setup unsigned long baudrate unsigned char dummy extsio baudrate baudrate EXTSIO LCR 0x03 8 bit 1 stop no parity EXTSIO IER 0x00 disable all interrupts EXTSIO MCR 0x00 dummy dummy EXTSIO_LSR EXTSIO_MSR EXTSIO_RBR i void extsio putchar unsigned char c while EXTSIO_LSR amp 0x20 0 EXTSIO_THR c Receive a character from the external UART If no characters have been received 1 is returned E nM RT me int extsio getchar void if EXTSIO_LSR amp 0x01 return unsigned EXTSIO_RBR return 1 Pa O O O O OO O O O O OOO O O O _getkey replacement for external UART DI e D A AA M EE AT eee char _getkey void int c while c extsio_getchar 1 return c 48 Chapter 4 Programming f ismi putchar replacement for external UART DU a PSR ATA A ATA IN char putchar char c extsio putchar c return c n SSS SS O O O O O O O SSS SSS SESS SSIS SSS Wait dummy function See ae a RT TUN ea N ee ERUNT EE Setup the external UART for 57600 baud write the string Hello World nnn and repeat void main void eee int counter 0 extsio setup 57600 for counter 0 cou
13. to ensure accuracy in this manual and to give appropriate credit to persons companies and trademarks referenced herein MCB251 Evaluation Board User s Guide iii Preface This manual describes the Keil Software MCB251 Evaluation Board and the MCS 251 microcontroller software development tools The following chapters are included Chapter 1 Introduction gives an overview of this user s guide and provides a quick start table Chapter 2 Setup describes how to connect and configure the board and provides detailed information about the DIP switches and configuration jumpers Chapter 3 Hardware provides detailed information about hardware including the schematic drawings for the MCB251 board the logic equations for the PLD and the memory locations of the different Monitor versions contained in the EPROM Chapter 4 Programming gives details about how to use our tools to generate programs for the MCB251 evaluation board Chapter 5 Using the 251 Monitor gives a quick overview about the MON251 terminal program NOTE This manual assumes that you are familiar with Microsoft Windows and the hardware and instruction set of the 8051 and 251 microcontrollers iv Preface Document Conventions This document uses the following conventions Examples Description README TXT Bold capital text is used for the names of executable programs data files source files environment variables and commands
14. use the external UART to send and receive serial data The _getkey and putchar routines are included for use with the stream functions like printf include lt reg251s h gt include lt stdio h gt define DELAY 50000L define EXTSIO_ADDR OxFFE700UL define EXTSIO_RBR volatile unsigned char far EXTSIO_ADDR define EXTSIO_THR volatile unsigned char far EXTSIO_ADDR define EXTSIO_IER volatile unsigned char far EXTSIO_ADDR 1 define EXTSIO_IIR volatile unsigned char far EXTSIO_ADDR 2 define EXTSIO_LCR volatile unsigned char far EXTSIO_ADDR 3 define EXTSIO_MCR volatile unsigned char far EXTSIO_ADDR 4 define EXTSIO_LSR volatile unsigned char far EXTSIO_ADDR 5 define EXTSIO_MSR volatile unsigned char far EXTSIO_ADDR 6 define EXTSIO_SCR volatile unsigned char far EXTSIO_ADDR 7 define EXTSIO_DLL volatile unsigned char far EXTSIO_ADDR 0 define EXTSIO_DLM volatile unsigned char far EXTSIO_ADDR 1 define EXTSIO_CLK 1843200UL n This function sets UART on the MCB251 void extsio baudrate unsigned long baudrate unsigned long baud divisor unsigned char lcr_save lcr_save EXTSIO_LCR EXTSIO_LCR 0x80 Save LCR Set DLAB baud_divisor EXTSIO_CLK 16UL baudrate EXTSIO DLL EXTSIO_DIM unsigned char unsigned char baud divisor amp OxFF baud_divisor
15. 1DFFFH 1DFF8H 1DFF9H no Flash LED s 251 Monitor Binary Mode 1E800H 1FFFFH 1FFF8H 1FFF9H NOPAGE no Flash LED s MCB251 Evaluation Board User s Guide 27 Chapter 4 Programming Writing programs for the MCB251 is relatively simple However before you get started there are a few points you should keep in mind a The 251 supports a new hardware architecture that is different from that of the 8051 The 251 begins executing instructions at address OFF0000h The MCB251 is shipped with the Keil 251 monitor programmed into an EPROM on the MCB251 board The MCB251 board has Monitor boot logic which is coded in the PLD device At Reset the Monitor EPROM is addressable at address OFFOOOOh After the execution of the first Monitor instruction the Monitor EPROM is addressed at OFFE800h OFFFFFFh If you use the monitor for loading and running programs via the serial port on the MCB251 your programs still start at address OFFOOOOh or C 0000 This is the same address as if you do not use a monitor program This following sections provide more information about writing programs for the MCB251 evaluation board Monitor Memory Map The MCB251 evaluation board supports 248 KB RAM memory which is addressable by for user application programs The memory map depends on how you use the A17 address line Refer to the 251 Microcontroller User s Manual for more information about the memory map of the 251 CPU Monitor Memory Mapping Monitor DIP
16. 8051 compatible device is installed 51 151 should be ON If a 251 compatible device is installed 51 151 should be OFF unless the 251 is emulating an 8051 or 151 device A17 Default ON The A17 switch selects whether the 251 CPU uses P1 7 as the A17 address line or whether P1 7 is used as I O port line When A17 is ON the A17 line is used and you can address up to 256KB memory with the 251 device When A17 is OFF P1 7 can be used as I O port line Note that the CONFIG BYTES of the 251 CPU must be programmed correctly to use this feature Chapter 2 Setup The Monitor EPROM which is supplied in the MCB251 board is configured for 256KB memory Refer to the 25 or 151 Microcontroller User s Manual for more information If you use the MCB251 board with an 8051 compatible device such as the Intel 151 or Dallas 320 the A17 DIP switch must be OFF MAP1 MAPO Default OFF OFF The MAP1 and MAPO switches select the memory map for the MCB251 The memory map used on the MCB251 board depends on the setting of the Monitor DIP switch The memory for both settings are shown in the following tables Monitor Memory Mapping Monitor DIP Switch is ON Mapi Map0 RAM Monitor EPROM UART CS amp USER CS OFF OFF 00 0000h 01 FFFFh FF E800h FF FFFFh UART FF E400h FF E7FFh 251 Mode FE 0000h FF DFFFh USER FF E000h FF E3FFh OFF ON illegal illegal illegal ON OFF illegal illegal illegal ON ON X 0000h X DFFFh C E800h C FFFFh UART
17. Additionally you may specify a temporary directory for the compiler and linker to use when compiling and linking 40 Chapter 4 Programming Set the Make Options for the Project Finally the make options control how Vision processes the files in your project Open the Make Options dialog box by selecting the Make command in the Options menu After Compile After Make l Misc l Extensions jes Compile 3j Sto DUE Linker _ Cancel C Run LIB251 Librarian Help GR BI Default Make sure vou select the Run L251 Linker radio button This links vour source files after compiling them MCB251 Evaluation Board User s Guide 41 Build the Project Now you are ready to build the project Select the Make Build Project command from the Project menu to begin compiling and linking Vision responds by compiling the BLINKY C source file and linking it with the appropriate library files This is called making the project While the make is running UVision displays the status as shown below Project Status BLINKY PRJ Source File BLINKY C Object File BLINKY OBJ Total Time 00 00 02 Status Compiling If errors occur during the make process a message window appears If there were warnings or errors in your source file you may interactively select the error and see the corresponding line in your source file When make completes successfully you are ready to begin debugging t
18. Jumper 9 PAGE DIP Switch ss 7 PAD sociedad did 15 PAL Equations eee 23 Power Supply Circuitry 14 Printed Board Assembly 22 UEL 46 Programming eene 27 Prototyping Area sess 17 Push Buttons 16 AAA Asada ses 46 S Schemati s ki A enin 18 Serial Bottes ava 16 Nnm 3 Software Requirements 3 SRC D2 DIP Switch 6 Status LEDS i sa eee 16 T Technical Data 23 Temic 251A1 nee 14 Temic 251G1 nee 14 16 U VAR Tita ind 16 Uart INT DIP Switch 6 Using Vision LL ena 32 Using dScOpe eee 42 W Writing Programs for the 251 Monitor 30
19. ON THEN Chapter 3 Hardware Monitor switched on H BEGIN A16 ROM LED IF MAP 1 0 b11 THEN BEGIN RD RAM PSEN A 16 8051 Mode A16 RAM 0 END ELSE BEGIN RD RAM PSEN A16 RAM A 16 END IF MON RUN THEN BEGIN MON RUN RST IF MAP 1 0 b11 THEN 8051 Mode BEGIN CS RAM A 15 A 14 A 13 Address 0 dfff END ELSE BEGIN CS RAM A 17 A 16 A 15 A 14 A 13 Address 0 3dfff END CS_ROM A 17 A 16 A 15 A 14 Address 3e800 3efff A 13 A 12 A 11 A 17 A 16 A 15 A 14 Address 3 000 3ffff A 13 A 12 END ELSE BEGIN CS ROM 1 ROM always enabled CS RAM 0 RAM always disabled IF A 17 10 b11111010 THEN Address 3e800 3ebff BEGIN MON RUN PSEN RST END ELSE BEGIN MON RUN 0 END END END ELSE Monitor switched off BEGIN CASE MAP 1 0 BEGIN 0 BEGIN CS RAM A 17 A 16 RAM 00000 2ffff CS ROM A 17 A 16 CS UART CS USER ROM 30000 3dfff A16 ROM A 16 A16 RAM A 16 RD RAM PSEN END 1 BEGIN CS RAM A 17 RAM 00000 1ffff CS ROM A 17 CS UART CS USER ROM 20000 3dfff A16 ROM A 16 A16 RAM A 16 RD RAM PSEN END 2 BEGIN CS RAM A 17 A 16 A 15 RAM 0000 O7FFF CS ROM CS RAM CS UART CS USER ROM 00000 3ffff MCB251 Evaluation Board User s Guide 25 Chapter 3 Hardware Monitor EPROM Addresses This following table lists t
20. Project To set the L251 linker options select the L251 Linker command from the Options menu pVision displays the L251 Linker Options dialog box shown below Listing l Linking l Segments Misc l Additional l Files Class 3 Cancel Class 4 Help Reserve 1 xFF0003 0xFF0005 0xFF003B 0xFF003D Reserve 2 0xFF007B 0xFF0070 Default Assign 1 aa Assign 2 i dl Command Line Options String IRE 0xFF0003 0xFF0005 0xFF003B 0xFF003D 0xFF007B OxFF007D 8 Enter the following text in the Reserve text boxes on the Misc tab shown above OxFF0003 OxFF0005 OxFF003B OxFF003D OxFF007B OxFF007D This creates the reserve directive that tells the linker that memory areas OxFF0003 0xFF0005 OxFF003B 0xFF003D and OxFF007B OxFF007D should not be used for program code This reserves the space for the interrupt vectors MCB251 Evaluation Board User s Guide 39 Set the Path Specifications for the 251 Tools You may wish to specify the path to the 251 tools directly in uVision You may do this in the Environment Pathspecs dialog box Open this dialog box using the Environment Pathspecs command in the Options menu Environment Pathspecs BLINKY PRJ Ix T Automatically determine path specifications BIN File Directoy CAC25B8IN INC File Directory EVER LIB File Directory EVER IMP File Directory CTEM cen tes You may specify the path to BIN directory the INC directory and the LIB directory
21. RESET D WAND MCB251 Evaluation Board User s Guide Technical Data Supply Voltage 8V 12V DC Supply Current typical 300mA System Clock 12 MHz Memory 256 Kbytes RAM 128 Kbytes Monitor EPROM optional 256 Kbytes User EPROM CPU Intel 80C251SB or Temic 80C251G1 optional Dallas 80C320 Intel 80C151 Intel 80C51FC or compatible device Peripherals 2 x RS232 Interfaces PAL Equations This following lists the PAL equations for the 20V8 logic device at IC12 PALASM Design Description PARA OA AO Declaration Segment TITLE GAL for MCB251SB Prototype board PATTERN Decoder and Boot Logic REVISION 1 0 AUTHOR Hans Schneebauer COMPANY Keil Elektonik GmbH DATE 10 06 96 CHIP IC6 PALCE20V8 SS SOS OSOS Ee EE PIN 1 LED COMBINATORIAL INPUT PIN 2 RST COMBINATORIAL INPUT PIN 3 PSEN COMBINATORIAL INPUT PIN 4 11 A 10 17 COMBINATORIAL INPUT PIN 12 GND INPUT PIN 13 MAP 0 COMBINATORIAL INPUT PIN 14 MON_ON COMBINATORIAL INPUT PIN 15 RD_RAM COMBINATORIAL OUTPUT PIN 16 MON_RUN COMBINATORIAL OUTPUT PIN 17 CS_USER COMBINATORIAL OUTPUT PIN 18 A16_ROM COMBINATORIAL OUTPUT PIN 19 A16_RAM COMBINATORIAL OUTPUT PIN 20 CS_UART COMBINATORIAL OUTPUT PIN 21 CS_ROM COMBINATORIAL OUTPUT PIN 22 CS_RAM COMBINATORIAL OUTPUT PIN 23 MAP 1 COMBINATORIAL INPUT 5 PIN 24 VCC INPUT 24 j EQUATIONS IF MON_
22. X KEIL SOFTWARE MCB251 Evaluation Board MCS 251 Microcontroller Target Board for Intel 251SB Temic 251G1 A1 and Intel 151 and 8051 Derivatives User s Guide 07 97 Keil Software Information in this document is subject to change without notice and does not represent a commitment on the part of the manufacturer The software described in this document is furnished under license agreement or nondisclosure agreement and may be used or copied only in accordance with the terms of the agreement It is against the law to copy the software on any medium except as specifically allowed in the license or nondisclosure agreement The purchaser may make one copy of the software for backup purposes No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying recording or information storage and retrieval systems for any purpose other than for the purchaser s personal use without written permission Copyright 1995 1997 Keil Elektronik GmbH and Keil Software Inc All rights reserved Keil C51 and dScope are trademarks of Keil Elektronik GmbH Microsoft MS DOS and Windows are trademarks or registered trademarks of Microsoft Corporation IBM PC and PS 2 are registered trademarks of International Business Machines Corporation Intel MCS 51 MCS 251 ASM 51 and PL M 51 are registered trademarks of Intel Corporation Every effort was made
23. al time Create up to 50 program breakpoints Single step through your program a Step over subroutines Upload and download Intel HEX files and OMF 251 object files Display an online command help menu 50 Chapter 5 Using the 251 Monitor Starting the MON251 Terminal Program Use the following command line to start the MON251 terminal program MON251 coma com2 cow COMA INT14 NOINT BAUDRATE n where COM1 COM4 Specifies the serial port to use You may use the COM port number 1 2 3 or 4 as an abbreviation COM1 is used by default INT14 Specifies that the serial interface is accessed through the BIOS software interrupt 14H Direct hardware interrupts are not used You may use I as an abbreviation for INT14 NOINT Specifies that the serial interface is polled rather than interrupt driven Hardware interrupts are not used You may use N as an abbreviation for NOINT BAUDRATE n Specifies the baud rate to use If this option is omitted MON251 defaults to 9600 baud The value n specifies the baud rate Valid baud rates are 300 600 1200 2400 4800 9600 19200 38400 and 57600 You may use BR as an abbreviation for BAUDRATE The command line parameters of the MON251 terminal program may be set using the environment variable MON251 You may set this environment variable using the DOS SET command For example SET MON251 COM1 BAUDRATE 1200 If no parameters are included on the com
24. cribe each of the DIP switches of the MCB251 board Uart_INT Default ON The Uart_INT switch selects whether or not the external 16550 UART generates an interrupt on the microcontroller If Uart_INT is ON the interrupt output from the 16550 is connected to port pin 3 2 If Uart_INT is OFF the interrupt output from the 16550 is not connected to the microcontroller This switch is useful when using interrupt driven serial I O with the external UART You must set Uart_INT to ON if you want to halt execution of a user program within dScope ext_Uart Default ON The ext_Uart switch determines whether or not the chip select signal for the external 16550 UART is generated If ext_Uart is ON the chip select signal is generated and the Monitor program uses the external serial interface for communication The communication baud rate is 57600 BPS If ext_Uart is OFF the UART chip select is not generated and the Monitor program uses the on chip serial interface for communication In this case the communication baud rate is 19200 BPS SRC D2 Default ON The SRC D2 switch selects either SOURCE mode or BINARY mode on the 251 CPU If SRC D2 is ON SOURCE mode is selected If SRC D2 is OFF BINARY mode is selected When you use a 151 or 8051 device the SRC D2 must be OFF When you use the Dallas 320 520 device the SRC D2 must be ON to select a Monitor version which supports the Dual DPTR registers of that CPU Refer to CPU Selection on page
25. do so tvpe the following in the command window load blinkv this loads the blinky program g main this steps over the startup code and stops on the first line of main Once BLINKY is loaded the module window displays the BLINKY program as shown in the following figure MCB251 Evaluation Board User s Guide Module BLINKY Commands Go GoTilCurs StepQut Stepinto StepOver Stop 0 0 0 5 0 e fer ea GoTilCurs Stepinto StepOver StepOut Stop View Trace Assemble U You may now single step through the BLINKY program by clicking on the StepOver button on the right side of the module window As you step through the program you should see the LEDs on the MCB251 changing Parallel Ports x e Ports You may display the status of the I O ports in dScope pA rra Select the I O Ports command from the Peripherals P pa rerrrrr menu and dScope displays the dialog box shown on the pr Pee eee ee right P3 FF VV Veh As you step through the BLINKY program you will see how the Parallel Ports dialog box mirrors the LEDs on the MCB251 evaluation board When you are ready to exit dScope click on the Stop button in the module window and select the Exit command in the File menu NOTE You must stop the program execution of your target program before you can exit dScope 45 Chapter 4 Programming External UART Example The following example program shows you how to
26. e program BLINKY is an exercise you may use to test the MCB231 and verify that you can use the tools provided to generate a working program BLINKY blinks the LEDs on the MCB251 evaluation board The complete source listing for the program is shown below BLINKX C LED Flasher for the Keil MCB251 Evaluation Board include lt reg251s h gt A7 void wait void jis LE void main void unsigned int i a unsigned char j f while 1 ff for j 0x01 j lt 0x40 j 1 P1 amp 0x80 s Pl j Le Include 251SB header file wait function only to delay for LED flashes Delay var LED var Loop forever Blink LED 0 1 2 3 4 5 6 do not change A17 port line Output to LED Port for i 0 i lt 10000 i Delay for 1000 Counts wait pe for 3 0x40 j gt 0x01 3 gt gt 1 P1 amp 0x80 PI j fo for i 0 i 10000 i wait call wait function Blink LED 6 5 4 3 2 1 do not change A17 port line Output to LED Port Delay for 10000 Counts call wait function y tiff You may build the BLINKY example program either using the 251 tools from the MS DOS command line or you may use the u Vision integrated development environment and dScope Both methods are described below 31 32 Chapter 4 Programming Using the MS DOS Command Line Tools Use the following command li
27. ge 23 MCB251 Evaluation Board User s Guide Chapter 2 Setup The MCB251 evaluation board requires power and a serial connection to a PC running the MON251 terminal program Before you start make sure you have satisfied the following hardware and software requirements Hardware Requirements The MCB251 Evaluation Board A serial cable 9 pin male to 9 pin female 1 2 meters long wired one to one APC with an available RS 232 port If the port has a 25 pin connector a 9 pin male to 25 pin female adapter may be required a A device programmer is required to program any EPROMs or other programmable devices Software Requirements The Keil MON251 terminal program MON251 EXE or the Keil dScope for Windows with the MON251 DLL driver The Keil MON251 software firmware is already programmed into the EPROM provided on the MCB251 board a Microsoft Windows version 3 1 3 11 Windows 95 or Windows NT Chapter 2 Setup Using the MCB251 To use the MCB251 evaluation board you must Connect the external serial port jack EXT RS232 to a serial port on your PC using the supplied serial cable Connect power using a power supply provided The serial cable lets your PC download program code and debug your target applications The power cable provides power to the MCB251 evaluation board The MCB251 does not get power from the PC via the serial cable The following illustration shows MCB251 board and the important i
28. ge 6 and Configuration Jumpers on page 9 for a complete description of the DIP switches and configuration jumpers Buffers The MCB251 provides complete support for 251 page mode and non page mode To do this the MCB251 includes 2 latches for the data address bus MCB251 Evaluation Board User s Guide 15 In non page mode the 251 151 multiplexes the address bus A0 A7 and data bus DO D7 on port 0 This is the same way the standard 8051 works To support non page mode the configuration jumpers must be in the NONP position In non page mode the address bus port 0 is latched using the 74HC373 at ICH In page mode the 251 151 multiplexes the address bus A8 A15 and data bus DO D7 on port 2 To support page mode the configuration jumpers must be in the PAGE position In page mode the address bus port 2 is latched using the 74HC373 at IC15 NOTE The CPU configuration bytes must be set according the board configuration for page or non page mode Refer to the 251 151 data book for more information about the CPU configuration bytes The Monitor EPROM contains pre configured Monitor versions for page and non page mode These are selected with the PAGE DIP switch To select a Monitor version for PAGE mode the PAGE DIP switch must be ON Decode Logic All memory address decode logic and other signal conversions are performed by the 20V8 PAL at IC12 Refer to PAL Equations on page 23 for a complete listing of the PAL
29. he BLINKY program 42 Chapter 4 Programming Using dScope to Debug the BLINKY Program To load the BLINKY in the MCB251 evaluation board using dScope you need to perform the following steps Load the MON251 DLL CPU driver Configure the CPU driver for the appropriate COM port and baud rate Configure the CPU driver for serial break Load the BLINKY program Step through the BLINKY program Each of these steps is described in detail below Start dScope by selecting the dScope Debugger command from the Run menu This loads dScope and sets the current path to the path in which your project file is saved MCB251 Evaluation Board User s Guide 43 When dScope starts a screen similar to the following displays dScope File View Setup Help enesmetbbiji Module lt none gt BEE Commands Go GoTilCurs StepOut Stepinto StepOver Stop S 00000000 e al 00000009 Jaleo jeje el ch 00000000 Register amp 00000000 WwRi6 0000 0000 Window GoTilCurs 0000 0000 a 0000 0000 Stepinto 0000 0000 StepOver 0001 0000 0000 0007 StepOut PSW R0 Stop CE NU c 0000 0 0 000000 Module Window l Command Window laScope 251 Windows V1 3e JCOPVRIGHT KEIL ELEKTRONIK GmbH 1996 b Idos ASM ASSIGN BreakDisable BreakEnable To load the MON251 DLL CPU driver type the following in the command window
30. he EPROM addresses in the Monitor EPROM for the different monitor versions and contains the EPROM addresses of the 251 151 configuration bytes CONFIGO and CONFIGI At address O and address 10000H the Monitor EPROM contains a LIMP OE800H instruction Monitor Version EPROM Addresses Monitor Program Code CONFIGO fore l zrek 8051 151 Monitor PAGE Mode 00800H 01FFFH 01FF8H 01FF9H with Flash LED s 251 Monitor Source Mode PAGE 02800H 03FFFH 03FF8H 03FF9H with Flash LED s 8051 151 Monitor PAGE Mode 04800H 05FFFH 05FF8H 05FF9H with Flash LED s 251 Monitor Binary Mode PAGE 06800H 07FFFH 07FF8H 07FF9H with Flash LED s 8051 Monitor Dallas 320 Version 08800H O9FFFH with Flash LED s251 251 Monitor Source Mode 0A800H OBFFFH OBFF8H OBFF9H NOPAGE with Flash LED s 8051 151 Monitor NOPAGE 0C800H ODFFFH ODFF8H ODFF9H with Flash LED s 251 Monitor Binary Mode 0E800H OFFFFH OFFF8H OFFF9H NOPAGE with Flash LED s 8051 151 Monitor PAGE Mode 10800H 11FFFH 11FF8H 11FF9H no Flash LED s 251 Monitor Source Mode PAGE 12800H 13FFFH 13FF8H 13FF9H no Flash LED s 8051 151 Monitor PAGE Mode 14800H 15FFFH 15FF8H 15FF9H no Flash LED s 251 Monitor Binarv Mode PAGE 16800H 17FFFH 17FF8H 17FF9H no Flash LED s 8051 Monitor Dallas 320 Version 18800H 19FFFH no Flash LED s251 251 Monitor Source Mode 1A800H 1BFFFH 1BFF8H 1BFF9H NOPAGE no Flash LED s 8051 151 Monitor NOPAGE 1C800H
31. his example uses CABLINKY for the source files and project files MCB251 Evaluation Board User s Guide 35 Create the BLINKY Project File After you save BLINKY C you should create a BLINKY project file A project file contains a list of all the source files in your project as well as the options to use for the compiler assembler linker and make facility Additionally the project manager helps you compile link and test your target program To create a project file for BLINKY select the New Project command from the Project menu uVision displays the dialog box shown below Enter the name for the project in the File Name text box This example uses BLINKV PRJ Create New Project x File name Folders blinky prj cAblinky Cancel v cc 3 blinky DES List files of type Drives Project File prj M amp c reinhard c y NOTE Always use PRJ as the file extension for project files 36 Chapter 4 Programming Include BLINKY C in the Project When the project file is created uVision displays the Project Manager dialog box Here you select the source files to include in your project Project CABLINKY BLINKY PRJ x Source Files Add Save Remove Cancel Move Up Help Move Down Open Open All Translator C251 Compiler zl Command F Always Build Include in Link Lib Object Eatal Error Warning Bonk number error level error level error level Click the Insert bu
32. k Refer to the figure at the right to determine how the DB9 connector for this port is wired Prototyping Area A perforated area is provided on the MCB251 for prototyping your own hardware All CPU signals necessary to create a 40 pin DIP plug for emulating an 8051 or 251 in a 40 pin DIP package are connected to this prototyping area In addition the data and address bus signals and the user chip select signal are connected to this area The signals provided are driven directly by the CPU Exercise caution to avoid overloading these signal lines Refer to DIP Switches on page 6 for the pin out of the CPU and bus signals NOTE Since the MCB251 supports both the page mode and non page mode you should connect memory mapped devices directly to the data bus DBO DB7 and AO A15 18 Chapter 3 Hardware Schematics gs ih RET 12 23 34 ke x D 2 1 51 zi E sz ik B ER I L 21 20 31 32 11 35 ME V 30 D ee Gel JIP13 ANB CEXO EAD3 Di E E2 omo Is 7 D PEREON PO 3 a E mm gm 9 80C251A1 AE Wale 2 a Sr dese ES e SC jq s D NT E 0 D WR 3 H Em a WR ei TXRDY a RXRDY A xN wat ve VDD hal h RERE E VREF EL to KA k d E 4 E 3 RE e 21 20 32 3 10 35 KTALIXTAL2 PSEN ALE PROG RST EA Vpp al P17 CEX4 P16 CEX3 P15 CEX2 P14 CEX1 P13 CEXO P4127280 P11 T2EX P10 T2 a P37 RU 80C2515B P36 WR P35 11 P34 TO P33 NTT P32 NTC P3 TXD P30 VSS VSS VSS2 VSS22 VI VCC MCB251
33. mand line MON251 uses the MON251 environment variable settings If the environment variable settings are used the MON251 terminal program displays the following message ENVIRONMENT STRING MON251 lt parameters gt MCB251 Evaluation Board User s Guide 51 Terminal Commands The MON251 terminal program supports the following commands Exit Exit MON251 and return to DOS u FI Exit MON251 and return to DOS u F2 Transmit the contents of a file u F3 Echo the contents of the screen to a file Help Display the help menu Comment lines Exit Exit MON251 and Return to DOS This command closes all files and returns to DOS For example EXIT F1 Exit MON251 and Return to DOS When you enter F1 or Alt 1 MON251 responds with the following prompt EXIT MON251 y or n Enter Y to exit MON251 close all files and return to DOS F2 Transmit the Contents of a File When you enter F2 or Alt 2 MON251 responds with the following prompt Input File Here you may enter a file from which MON231 inputs and interprets commands For example Input File MYINIT CMD lt cr gt directs MON251 to read the contents of the file MYINIT CMD and interpret them as commands You may press Ctrl C to stop retrieving commands from the file 52 Chapter 5 Using the 251 Monitor F3 Echo the Contents of the Screen to a File When you enter F3 or Alt 3 MON251 responds with the following prompt Output File Here you may
34. mes with a Monitor EPROM which contains several different Monitor configurations Most of the Monitor configurations are required to run the different CPU types on the board The following Monitor settings are independent of the CPU type used in the MCB251 board Monitor Mode ext_Uart ON use EXT RS232 interface 57600 BPS for Monitor communication OFF use INT RS232 interface 19200 BPS for Monitor communication LED ON display Monitor status on Port 1 LED s see below OFF Monitor status is not displayed and Port 1 is not affected Monitor ON use Monitor program for debugging OFF User EPROM as IC13 Refer to MAP1 and MAPO DIP Switch on page 7 to for the User EPROM Memory Map NOTE Some derivatives of the 8051 and 251 microcontroller family do not have a compatible serial interface or baud rate generator for the internal serial interface For such devices it is impossible to use the INT RS232 interface Currently the Temic 251A1 and standard 8051 CPU are not compatible With these devices you can only use the Monitor with the EXT RS232 interface the ext_Uart DIP switch must be ON Monitor Status Display During the reset phase the Monitor program displays status information on the Port 1 LEDs This status information reflects the board configuration and signals that the board is working correctly The status byte is shifted to the left which flashes LED s during the reset phase The following table list
35. ne to compile the BLINKY example program C251 BLINKY C DEBUG MODSRC Use the following command line to link the BLINKY example program for use with the 251 monitor L251 BLINKY OBJ RESERVE 0FF0003H 0FF0005H OFFOO3BH OFF003DH OFFOO7BH OFFOO7DH Using the Windows Based Tools This section leads you step by step through the process of creating the BLINKY example program and testing it using the Vision IDE and dScope debugger Using Vision to Create the BLINKY Program To create the BLINKY example program using uVision you need to perform the following steps Create the BLINKY C source file Create the BLINKY project file Include BLINKY C in the project Set the C251 compiler options for the project a Set the L251 linker options for the project Set the path specifications for the 251 tools if necessary a Set the make options for the project Build the project Each of these steps is described in detail below MCB251 Evaluation Board User s Guide 33 Create the BLINKY C Source File Start uVision by double clicking on the icon in the 251 Tools group Keil DK251 File Edit View Help dScope Release Mon25 RISM 251 Version 1 2 Version 2 0 Notes 300 bytes HVision Program Icon When uVision starts select the New command from the File menu and Vision opens a new text window in which you may create the BLINKY program Enter the BLINKY example program shown on page 31 Your screen sho
36. nter unsigned long i printf Hello World u r n unsigned counter 100 for i 0 i lt DELAY i wait Use the following command line to compile the external UART example program C251 EXTSIO C DEBUG MODSRC Since this example program uses the external UART you must generate a HEX file and program an EPROM Use the following command line to link L251 EXTSIO OBJ and the following command line to generate an Intel HEX file OH251 EXTSIO You may then use the EXTSIO HEX file to program an EPROM MCB251 Evaluation Board User s Guide 49 Chapter 5 Using the 251 Monitor The MCB251 comes ready programmed with the Keil 251 monitor MON251 The monitor programmed in the Monitor EPROM is setup to communicate at 57 600 baud using the EXT RS232 interface and 19 200 baud using the INT RS232 interface with a 12MHz oscillator Xou mav use the MON251 DOS terminal program MON251 EXE or the dScope for Windows debugger simulator to quickly download and test your programs MON251 Terminal Program The MON251 terminal program communicates with the 251 monitor using one of your PC s serial ports MON251 lets you a Display the contents of the 251 s memory areas in ASCII and hexadecimal Interactively change memory contents Display and change register contents a Initialize memory with constant values a Disassemble the code area Assemble in line code Run programs with breakpoints in re
37. nterface and hardware components Signals DIP Prototyping Bus Monitor Switches Area Signals EPROM 251 on chip m pce NA Serial Jack 3 B e cs External Configuration li l Serial Jack Jumpers E i vu 2 LL AGE Ice Seg d Interrupt D PU cS i ES 75 wi SS P e LI D 07 os Button POAP15 POSP16 PoE PIT A 1 E e Reset Button PSENPA2 B Power KI kW Port mn dde E X Supply P22NCZ Intel 251SB Temic 251G1 Dallas 320 or Standard 8051 Port 1 Status LED s Socket for Temic 251A1 MCB251 Evaluation Board User s Guide Configuring the MCB251 You configure the MCB251 evaluation board with the DIP switches and the configuration jumpers The MCB251 evaluation board is shipped with the following configuration Intel 87C251SB or Temic 251G1 microcontroller Source Mode with 0 Wait States Non Page Mode The default DIP switch settings are shown in the following table Switch Uart ext SRC Page Moni 51 MAP MAP LED A17 Int Uart D2 tor 151 1 2 ON X X X X X X OFF X X X X The default settings of the configuration jumpers are shown in the following figure The NONP jumper selects the Non Page Mode of the 251 CPU The INT1 and NMI jumpers are set to connect the Interrupt Button to the INT1 source Chapter 2 Setup DIP Switches The following sections des
38. ntroller User s Manual NOTE The settings in the following table are only relevant only for the Monitor EPROM Monitor DIP switch ON When the Monitor DIP switch is OFF you may select the Memory Mapping and the CPU type with the MAPO and MAPI DIP switches CPU Type DIP Switch Setting CPU Config Bytes and Operating Mode Page Src D2 Map0 Mapi Configo Configi 251SB 251G1 or 251A1 ON ON OFF OFF ON OFih 097h Page Mode Source Mode 251SB 251G1 or 251A1 ON OFF OFF OFF ON OFOh 097h Page Mode Binary Mode 251SB 251G1 or 251A1 OFF ON OFF OFF ON OF3h 097h Non page Mode Source Mode 251SB 251G1 or 251A1 OFF OFF OFF OFF ON OF2h 097h Non page Mode Binary Mode Intel 151 Page Mode ON OFF ON ON OFF OFCh 0E7h Intel 151 Non page Mode OFF OFF ON ON OFF OFEh 0E7h Standard 8051 Derivatives OFF OFF ON ON OFF N A N A Dallas 320 520 OFF ON ON ON OFF N A N A NOTE The Temic 251A1 and 251G1 are currently available only as A step devices The operating mode of this device is programmed inside the CPU and cannot be changed in an external EPROM If you use one of these devices you must set the PAGE DIP switch OFF and the SRC D2 DIP switch ON This restriction does not apply when the 251A1 and 251Gl are available in C step technology The Intel 251SB CPU may be used to emulate the Intel 151 CPU This lets you test 151 applications without replacing the 251SB CPU MCB251 Evaluation Board User s Guide 11 Monitor Modes The MCB251 board co
39. power supply which is capable of providing 300 500mA Connection is made using a standard 13 14 Chapter 3 Hardware 5 5mm barrel plug with a 2 5mm center hole The center hole provides positive voltage 5 Volts DC is generated and provided to the board by a 7805 voltage regulator at IC2 To reduce the noise for the 251A1 A D converter a second 78L05 voltage regulator is provided at IC6 251 8051 CPU The Intel 251SB or Temic 251G1 provided with the MCB251 are 251 derivatives with 1 Kbytes of internal RAM The CPU is located at IC1 The IC1 socket can accommodate a Dallas 320 or 520 CPU an Intel 151 or a standard 8051 microcontroller You may use the Temic 251A1 CPU in the IC4 socket However you must remove the CPU in socket ICI when you use the 251A1 A 12 000 MHz crystal provides the clock signal for the CPU NOTE You may insert only one CPU into the board at a time It is not possible to operate with a Temic 251A1 in socket IC4 and another 251 8051 CPU in socket ICI simultaneously Configuration The MCB251 is a very flexible evaluation board You can change the operation of the board using the DIP switches and the configuration jumpers Features such as CPU type LEDs page mode memory map push button inputs external UART interrupts and on chip serial port can all be configured using these switches NOTE You must RESET the MCB251 after changing the state of any DIP switch Refer to DIP Switches on pa
40. r the 251 Monitor Compiling and linking programs for use with the 251 monitor on the MCB251 board requires only two steps First compile your applications as you normally would Make sure that you have selected the correct mode MODBIN or MODSRC directive to specify 251 operating mode you have configured on the MCB251 board For example you may use the following command line C251 MYCODE C MODSRC Second link your object files using the CLASSES directive shown in the following example command line L251 MYCODE OBJ RESERVE OFFO003H OFFO0O05H OFFOO3BH OFF003DH OFFOO7BH OFFOO7DH In this command line the RESERVE directive tells the linker not to use the specified address space for the user application NOTE The only difference between writing programs for the Monitor 251 compared to other user applications is the RESERVE directive for the L251 linker However you can Still use the RESERVE directive if you want to program your application into an EPROM You may use the OH251 utility to create an Intel HEX file from the absolute object module created by the linker Use the following command line to create a HEX file OH251 MYFILE You may use either Intel HEX files or absolute object modules with the dScope debugger and the MON231 terminal program Absolute object modules include source level debugging information but HEX files do not MCB251 Evaluation Board User s Guide BLINKY Example Program The following simpl
41. s the first phase of the LED pattern Monitor Version P1 7 P1 6 P1 5 P1 4 P1 3 P1 2 P1 1 O Monitor 251 and 251 CPU A17 OFF OFF OFF OFF OFF OFF ON Monitor 51 for 151 or 8051 CPU ON ON ON ON ON ON ON Monitor 51 for Dallas 320 520 ON OFF ON OFF ON OFF ON The P1 0 status LED is ON when the INT RS232 interface is used for the Monitor PC interface and OFF when the EXT RS232 interface is used for the Monitor PC interface Chapter 2 Setup MCB251 Evaluation Board User s Guide Chapter 3 Hardware The MCB251 is designed to be a very flexible evaluation board that you can use to compare the effectiveness of the 251 versus the 8051 We have attempted to support all features of the 251 while remaining compatible with the 8051 We have also tried to provide a board that can be expanded to support your own hardware prototypes This chapter describes logical sections of the MCB251 and also provides a circuit description The descriptions here will help you understand how the MCB251 board works and how you can easily interface to the various I O devices available The following block diagram shows the various memory I O configuration and power systems that compose the board Memory Svstem User I O Buffers Internal Serial I O ry Buffer De eases oe Output Input BV 1 80 8 12V DC 400 mA Power Supply Power is supplied to the MCB251 from an external 8 12 Volt DC
42. tton and choose the BLINKY C file you previously saved Then click the save button to save your changes to the project file To return to the Project Manager dialog box select the Edit Project command from the Project menu When you have created a project file and inserted the source files into the project you are ready to set the options for the compiler linker and other tools MCB251 Evaluation Board User s Guide 37 Set the C251 Compiler Options for the Project To set the C251 compiler options select the C251 Compiler command from the Options menu and uVision displays the C251 Compiler Options dialog box The only options you need to set for the BLINKY example are Include debug information and Source Mode for Code generation These controls are shown in the following figure Listing Object l Optimization l Memorv Model Misc Make sure to include debugging information in the object file Interrupt Vectors xy Iv Include in object Cancel Offset 0 ip F Save PSWI in C251 int code Default T Generate Registerbank Independant Code Code Generation Source Mode T Include browser information r C251V2 argument passing Set Code Generation for Source Mode Command Line Options String DB NOTE In any of the option dialog boxes you may click the Default button to set the controls to the default settings 38 Chapter 4 Programming Set the L251 Linker Options for the
43. ue MCB251 Evaluation Board User s Guide Contents Chapter 1 Introduction s ccccccsecccseccsecsvecsscssscosssosssessoecsevoesvocsvbessoscsvoassosesvossecsesess 1 e GE 2 Chapter 2 Sep ee 3 Using the MCB25 l is oe Savini ariel ere E ava ae 4 Configuring the MCB251 ut ege e Pe A e 5 DIPS ae e atada 6 Conti guration JUmpers cia ceto ee ee co mdi Sb ee 9 CPU Selection io ito ta eter bis e etre e eet RE EEA REPE d eode trien 10 Monitor Modes eph pe re RC ee Pte e RE ceres 11 Monitor Status Dieplay sese enne enne rennen ene enne 11 Chapter 3 HardWare iouis eo eee yen obese oorr e Varta PI PROS S ERbe tege 13 NIMM a a ea SE EE Eggs 18 Printed Board Assembly 4 5 ea ette reete de re e e dias 22 Technical Data sect ta 23 PAL Equations iet eee 23 Monitor EPROM Addresses sccesscsseseeeceseseecseecesecesseceaceceeceeceecseeeasecssecsaeesaes 26 Chapter 4 Programming soesessosseseoesoseoesocssossoseoesocssesoosoessossossoossessossessose 27 Monitor Memory Map 27 Monitor Data amp Interrupt Vector 28 Writing Programs for the 251 Monitor 30 BLINKY Example Prograti 2 terrent a taa pere a pu RR S 31 External UART Example iconos eer ais creas Ee 46 Chapter 5 Using the 251 Monitor cccsscssssscssssscsssccsssescsssscssssssssesssssscees 49 MON251 Terminal Program eene terere ERG denter bns 49 vi Contents MCB251 Evaluation Board User
44. uld look something like the following figure wVision 251 BLINKY PRJ File Edit Project Run Options Tools Window osa B a 28 CIE El f BLINKY C include lt reg251s h gt void wait void H void main void unsigned int i unsigned char j while 1 for j 0x01 j lt 0x40 j lt lt 1 P1 amp 0x80 PI le j for i 0 i lt 1000 i wait for j 0x40 j gt 0x01 j gt gt 1 P1 amp 0x80 PI l j for i 0 i lt 1000 i wait Include 251SB header file x wait function x only to delay for LED flashes Delay var x LED var x Loop forever x Blink LED 6 1 2 3 4 5 6 do not change A17 port line Output to LED Port x Delay for 1000 Counts x call wait function x Blink LED 6 5 4 3 2 1 x do not change A17 port line Output to LED Port x Delay for 1000 Counts x call wait function x 34 Chapter 4 Programming You should save the BLINKY program after you enter it Select the Save As command from the File menu and uVision displays the Save As dialog box shown below Save As 2 x File name Folders blinky c cAblinky Cancel Network Save file as type Drives C Source c e amp c reinhard c x To save the program as BLINKY C enter BLINKY C in the File Name text box at the top of the Save As dialog box You may want to save the flash program and the other files you create in a separate directory T
45. uld not modify these locations Other than the interrupt vectors and the monitor data the monitor program does not use and other memory resources of the 251 CPU You must reserve the following address spaces with the L251 linker RESERVE directive When you reserve these memory areas the linker prevents your target program from using them Monitor Data Space and Interrupt Vectors Monitor Mode Interrupt Vectors Monitor Data Serial Interrupt disabled TRAP FF 007Bh FF 007Dh FF DFCOh FF DFFFh NMI FF 003Bh FF 003Dh EXT RS232 INTO FF 0003h FF 0005h FF DFCOh FF DFFFh Serial Interrupt enabled NMI FF 003Bh FF 003Dh TRAP FF 007Bh FF 007Dh INT RS232 SINT FF 0023h FF 0025h FF DFCOh FF DFFFh Serial Interrupt enabled NMI FF 003Bh FF 003Dh TRAP FF 007Bh FF 007Dh MCB251 Evaluation Board User s Guide 29 Monitor 51 The 8051 monitor does not require the use of any interrupt vectors The serial interrupt is not required for serial communication However if you enable the serial interrupt you must reserve the interrupt vector space for the internal interrupt 0 or serial interrupt The 8051 monitor uses the address space X 0xDF00 X 0xDFFF for monitor data If you enable Record Trace then the address space X 0xCC00 X 0xDFFF is used for monitor data The complete CODE XDATA space is von Neumann wired so that accesses to the XDATA space modify the data in the CODE space 30 Chapter 4 Programming Writing Programs fo
46. ur 251 or 8051 programs The MCB251 kit includes the following items a MCB251 Evaluation Board User s Guide this manual a MCB251 Evaluation Board a MCB251 Evaluation Board Software 9 pin Serial Cable a 9 VDC 500mA wall adapter power supply a anda251 Evaluation Kit which includes a 2K compiler Chapter 1 Introduction Quick Start Use the following list to quickly locate important information about the MCB251 evaluation board To See Connect power to the MCB251 board Using the MCB251 on page 4 Connect the MCB251 to your PC Using the MCB251 on page 4 Read about the default configuration settings Configuring the MCB251 on page 5 Create a simple program to blink the LEDs BLINKY Example Program on page 31 Write code to use the external UART External UART Example on page 46 Learn more about the uVision IDE Using Vision to Create the BLINKY Program on page 32 Learn more about the dScope debugger Using dScope to Debug the BLINKY Program on page 42 Learn about the MON251 terminal program Chapter 5 Using the 251 Monitor on page 49 Read about the DIP switch settings DIP Switches on page 6 Read about the configuration jumpers Configuration Jumpers on page 9 Configure the RAM ROM memory Monitor Memory Map on page 27 See the MCB251 schematics Schematics on page 18 See the MCB251 PAL equations PAL Equations on pa
47. you enter at the MS DOS command prompt This text usually represents commands that you must type in literally For example CLS DIR L251 EXE Note that you are not required to enter these commands using all capital letters Courier Text in this typeface is used to represent information that displays on screen or prints at the printer This typeface is also used within the text when discussing or describing command line items Variables Text in italics represents information that you must provide For example projectfile in a syntax string means that you must supply the actual project file name Occasionally italics are also used to emphasize words in the text Elements that Ellipses are used to indicate an item that may be repeated repeat Omitted code Vertical ellipses are used in source code listings to indicate that a fragment of the program is omitted For example void main void while 1 TAA Optional arguments in command line and option fields are indicated by Optiona tems double brackets For example C251 TEST C PRINT ilename f opt opt2 Text contained within braces separated by a vertical bar represents a group of items from which one must be chosen The braces enclose all of the choices and the vertical bars separate the choices One item in the list must be selected Keys Text in this sans serif typeface represents actual keys on the keyboard For example Press Enter to contin
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