m68332evkem/ad1
Contents
1. BTST B 50 SFFFCOC L 0000502C 67F6 BEQ B 5024 CPU32Bug gt MM 500C lt CR gt Modify memory at location 500C 0000500C 0120 OOFF lt CR gt Change PIT timeout speed CPU32Bug gt g 5000 lt CR gt Go to address 5000 and begin execution Effective address 00005000 PIT TIME OUT Periodic interrupt timer time out message PIT TIME OUT PIT TIME OUT Press the PFB ABORT switch to terminate the loop program Exception ABORT 200005018 SR 2500 TR OFF 5 5 VBR 200000000 SFC 5 SD DFC 5 SD USP 0000FC00 SSP 00010000 DO 00000000 D1 00000000 D2 00000000 23 00000000 04 00000000 D5 00000000 D6 00000000 D7 00000000 AQ 0000510 Al 0000510 A2 00000000 00000000 4 00000000 5 00000000 6 00000000 A7 00010000 00005018 6000FFF8 BRA W W 5012 3 4 M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS CPU32Bug gt T 1 lt CR gt PC 00005012 SFC 5 50 DO 00000000 D4 00000000 0000510E A4 00000000 00005012 F80001C0 Trace one instruction SR 2500 TR OFF_S_5_ DFC 5 SD D1 00000000 D5 00000000 1 0000510 A5 00000000 2500 LPSTOP W CPU32Bug gt BR 5034 lt CR gt BREAKPOINTS 00005034 CPU32Bug gt g 5000 lt CR gt PC 00005034 SFC 5 50 DO 00000000 D4 00000000 0 00005101 4 00000000 00005034 2 8 M68332EVKEM AD1 Effective address2. FE00 FFFF26 lt CR gt MOVE W 30 FFFFFE lt CR gt MOVE W 4 0EA9 FFFE12 CR MOVE W 38 FFFE16 lt CR gt MOVE W 3F FFFE1LE lt CR gt MOVE W 36 FFFE1A lt CR gt BRA W 6770 lt CR gt Bug gt GO 6700 lt CR gt Program 7 works in this way Line 6700 Line 6708 Line 6710 Line 6718 Line 6720 M68332EVKEM AD1 Loads the value 82 in the channel 0 control register so channel 0 operates in PWM mode Loads the value 100 as the pulse period high time in the PWMHI register Loads the value 800 as the overall pulse period in the PWMPER register Loads the value 07 in the channel 1 control register so channel 1 operates in ITC mode detecting rising edges Loads the value 210E in register FFFF12 This means that the start link channel field receives the value 0010 specifying a link to channel 2 channel 2 starts when channel 1 finishes The link channel count field receives the value 0001 specifying that channel 2 is the only destination channel The bank address field receives the value E which points to an unused location 3 35 EXAMPLE PROGRAMS MOTOROLA Line 6728 Line 6730 Line 6738 Line 6740 Line 6748 Line 6750 Line 6758 Line 6760 Line 6768 Line 6770 Loads the value 0200 in the channel 1 max count register This means that a link signal goes to channel 2 when channel 1 counts 200 rising edges Loads the value 8F in the channel 2 control register
3. PAt Breakpoint 00005018 USP 0000FC00 D2 00000000 D6 00000000 A2 00000000 00000000 Set breakpoint at 5034 SR 2600 TR OFF_S_6_ DFC 5 SD D1 00000000 D5 00000000 1 0000510 5 00000000 CMPA W USP 0000FC00 D2 00000000 D6 00000000 A2 00000000 00000000 A0 A1 52500 VBR 00000000 SSP 00010000 D3 00000000 D7 00000000 00000000 7 00010000 Begin execution at location 5000 Breakpoint terminates the program so P appears VBR 00000000 SSP 0000FFF8 D3 200000000 D7 200000000 00000000 A7 0000FFF8 3 5 EXAMPLE PROGRAMS MOTOROLA 3 2 APPLICATION PROGRAMS 3 2 1 3 6 This paragraph contains several examples each with an appropriate application program These examples will acquaint you with the time processor unit TPU section of the MC68332 Microcontroller Unit device while familiarizing you with the EVK At the end of this manual is a self test questionnaire to verify your understanding Each item of the questionnaire includes a cross reference back to the corresponding part of the manual text Should you answer a question incorrectly you easily would be able to review the correct information Example 1 Generating 5 Phase Locked Square Waves Many TPU functions involve such actions as counting positive edges counting negative edges and measuring pulse widths The most convenient place to obta
4. BCC PFB Jumpers Pins Jumpers Pins J1 1 2 J1 1 2 J2 2 3 J2 1 2 J3 2 3 J3 1 2 J4 1 2 J4 1 2 4 5 J6 1 2 J5 No Jumper J7 1 2 J6 No Jumper J8 1 2 J7 1 2 4 5 J8 J13 2 3 J14 1 2 M68332EVKEM AD1 1 3 GENERAL INFORMATION MOTOROLA 1 4 M68332EVKEM AD1 MOTOROLA SYSTEM CONFIGURATION CHAPTER 2 SYSTEM CONFIGURATION 2 1 INTRODUCTION If you are using the EVK make sure it is in the configuration shown in Figure 2 1 This configuration lets you generate debug and execute the program examples of this manual M68300PFB M68332BCC Figure 2 1 BCC Software Debug Configuration M68332EVKEM AD1 2 1 SYSTEM CONFIGURATION MOTOROLA 22 TERMINAL PERSONAL COMPUTER CONNECTION Connect the EVK to a dumb terminal or to a personal computer PC A terminal is cost effective but has no memory or disk drive Consequently a terminal does not let you save or download user developed code A PC does let you generate store and download user developed code but costs more than a terminal Figure 2 2 shows the cable assembly required for this connection Make up the cable assembly if such a cable is not already available Insert the small connector of the cable assembly into PFB connector P9 shown below one of the two 9 pin connectors of the PFB Insert the other connector of the cable assembly into a DB 25 serial I O port of the terminal or PC The inp
5. 011 which selects Toggle on Match The PSC field value is 11 which is arbitrary in this example e The offset register receives a value calculated by the TPU microengine in continuous mode Therefore Program 7 does not need to put a value in this register e The ratio register receives the numerator value of the actual ratio the TPU microengine uses to calculate the offset The denominator value always is FF For example if the ratio register receives the value 20 the calculation ratio is 20 FF The ratio register value FF yields a calculation ratio of 1 The offset value calculation is RATIO Ref Addr2 Reference address 2 the value of the ref addr2 field points to parameter RAM map Reference address 2 is an 8 bit pointer of which the upper 7 bits are specified Bit 0 is forced to 0 This forces 16 bit word alignment tracking with the alignment of the parameter RAM When reference address 2 is a pointer the upper 16 bits of the 24 bit address are assumed to be YFFF where Y can be 960111 the default is 761111 For example if the ref addr2 field receives the value 3A reference address 2 M68332EVKEM AD1 3 31 EXAMPLE PROGRAMS MOTOROLA 3 32 points to the fifth parameter location for channel 3 Obviously reference address 2 must not point to a parameter location used for something else It may however point to a parameter location that can be shared such as a common period for two diff
6. 14 value should be 1 To verify the output of Program 2 connect an oscilloscope to BCC connector P1 pin 46 Once the DIO mode is set up a programmer can set a selected timer pin high or low A possible application this permits is turning lights on and off in response to a photo detector signal Another possible application is activating a fuel injector for a specified time period upon detection of a timing mark Example 2 shows an important purpose of the DIO mode making a timer pin be a simple input output under program control M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS 3 2 2 2 Example 3 Event Detection Example 3 illustrates another important use of the DIO mode detecting an event such as a box on a conveyer belt passing in front of a photo detector then generating an interrupt if enabled and interrupt flag This requires detection of a timer pin state transition Program 3 or the user must perform these actions to use the state transition capability of the DIO mode 16 Connect jumper between the TPO pins of PFB connector 2 This is a physical connection the user must make the program does not make this connection Load the value 8 in the channel function select field of channel function select register 3 Load a priority value in the channel priority field of channel priority register 1 Note that there is no default priority if the program does not load a priority value the channel
7. 92 SFFFF00 lt CR gt MOVE W 2000 SFFFF04 lt CR gt MOVE W 4000 SFFFF06 lt CR gt MOVE W 9 SFFFE12 lt CR gt MOVE W 3 SFFFELE lt CR gt MOVE W 2 SFFFE1A lt CR gt BRA W 6030 lt CR gt CPU32Bug gt GO 6000 lt CR gt Program 1 works in this way Line 6000 Line 6008 Line 6010 Line 6018 Line 6020 Line 6028 Line 6030 M68332EVKEM AD1 Loads the value 92 in the channel control register This makes the timer pin an output forced low upon generation of a host service request Loads the value 2000 as the pulse period high time in the PWMHI register Loads the value 4000 as the overall pulse period in the PWMPER register Loads the value 9 in the channel function select register so channel 0 operates in PWM mode Loads the value 3 in the channel priority field to give channel 0 high priority Loads the value 2 in the host service request field generating a host service request for channel 0 Jumps to itself beginning an endless wait loop In actual practice this jump instruction would direct the program to the next task 3 9 EXAMPLE PROGRAMS MOTOROLA 3 2 2 3 10 Discrete I O Mode The discrete I O DIO mode is for sampling or driving logical values on timer pins according to the timer pin s configuration as an input or an output DIO mode is one of eight main TPU timer modes Common uses of this mode are e Driving an output timer pin high or low upo
8. Connect a jumper between the TPO and pins of connector P2 This is a physical connection the user must make the program does not make this connection Load into the channel control register the value that specifies the capture of and detection of rising edges As this exercise does not involve linking direct the bank address to unimplemented RAM Set the maximum count to 1 we will perform this function just once 5 Load into channel function select register 3 the value that determines that M68332EVKEM AD1 channel 1 operates in input capture mode and that channel 0 operates in PWM mode Load into the channel priority register the value that gives both channel 1 and channel 0 high priority Load into the host sequence register the value that determines the single shot sub mode for channel 1 Load into the host service request register the value that starts the input capture function 3 25 EXAMPLE PROGRAMS MOTOROLA 9 As soon as an input is captured read the time from the last transaction time register load into the channel control register the value that determines detection of falling edges and load into the host service request register the value that starts the input capture function 10 As soon as a falling edge input is captured read the time from the last transaction time register The difference between the two time values yields the high time in timer clock cycles
9. Counting Events 3 28 2205937 NAMING plea restat takitaqa ee nain ss 3 30 3 24 Example 7 Output Compare OC Mode eer tette etos eats 3 31 APPENDIXA EXERCISE MANUAL QUESTIONNAIRE 68 doe o Igea 1 M68332EVKEM iii CONTENTS MOTOROLA 1 1 2 1 2 2 3 1 3 2 3 3 3 4 1 1 3 1 3 2 3 3 3 4 FIGURES M68332B VK Eval uation Kit scio uo lagi UR peche di ent 1 2 BCC SoftWare osos 2 1 5 232 Terminal PC Cable Assembly ire tasses 2 3 PWM Mode 5 ied e RR RR assasi 3 7 Discrete DO Mode Parameters sie lan otter unido 3 12 3 23 OC Mode Parameters 3 33 TABLES Jumper 155 E TE 1 3 PWM Mode Channel Control deeds 3 8 Discrete I O Mode Channel Control Options ss 3 13 ITC Mode Channel Control ss 3 24 Mode Channel Control Options acsi Io Erbe tea te hee bows ed petu een 3 34 M68332EVKEM MOTOROLA GENERAL INFORMATION CHAPTER 1 GENERAL INFORMATION 11 INTRODUCTION This exercise manual introduces the MC6833
10. Enter program 5b below by typing in the bold characters Program 5b ITC Mode Square Wave Capture CPU321 6500 6508 6510 6518 6520 6528 6530 6538 6531 654 654 654 6554 655C 6564 656A 656E 6572 6578 6580 CPU321 GI EH o 3 26 Bug gt MM MOVE MOVE MOVE MOVE MOVE MOVE MOVE MOVE ANDI 6500 DI lt CR gt zx zx gt gt gt 7 SFFFF10 lt CR gt SE SFFFF12 lt CR gt 51 SFFFF14 lt CR gt SA9 SFFFE12 lt CR gt SF SFFFELE lt CR gt 50 SFFFE16 lt CR gt 54 SFFFE1A lt CR gt SFFFE20 D1 lt CR gt 2 D1 lt CR gt BEQ W 6538 lt CR gt MOVE MOVE MOVE MOVE MOVE ANDI 1 SFFFE20 lt CR gt FFFF18 D2 CR SSB SFFFF10 lt CR gt 54 SFFFE1A lt CR gt SFFFE20 D1 lt CR gt 2 D1 lt CR gt BEQ W 6564 lt CR gt MOVE W FFFF18 D3 CR MOVE W 1 SFFFE20 lt CR gt BRA W 6580 lt CR gt Bug gt GO 6500 lt CR gt M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS Program 5b works in this way Line 6500 Loads the value 7 in the channel control register Per Table 3 3 this makes channel 1 an input that captures detecting rising edges Line 6508 Loads the value E in the blank address field This directs the bank address to unimplemented RAM Line 6510 Loads the value 1 in the max count register so the function runs one time and stops Line 6518 Loads the value A9 in the channel
11. PULSES 0 NO INTERRUPT 1 INTERRUPT REF ADDR1 REF ADDR3 REF TIME ACTUAL MATCH TIME TCR1 TCR2 BY HOST CPU W CHANNEL NUMBER Figure 3 4 OC Mode Parameters M68332EVKEM AD1 ADDRESSES FFFEOC FFFE12 FFFE1C FFFE1E FFFE14 FFFE16 FFFE18 FFFE1A FFFEOA FFFE20 3 33 EXAMPLE PROGRAMS MOTOROLA Table 3 4 OC Mode Channel Control Options Action Output Force Pin as Specified by PAC Latches Force Pin High Force Pin Low Do Not Force Any State Do Not Detect Transition Do Not Change Pin State on Match Detect Rising Edge High on Match Detect Falling Edge Low on Match Detect Either Edge Toggle on Match Do Not Change PAC Do Not Change PAC Output Channel Capture TCR1 Match TCR1 Capture TCR1 Match TCR2 Capture TCR2 Match TCR1 Capture TCR2 Match TCR2 Do Not Change TBS Do Not Change TBS 3 34 M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS Enter Program 7 below by typing in the bold characters Program 7 Output Compare Mode CPU321 6700 6708 6710 6718 6720 6728 6730 6738 6740 6748 6750 6758 6760 6768 6770 CPU321 Bug gt MM 6700 DI lt CR gt MOVE W 82 FFFF00 lt CR gt MOVE W 100 FFFF04 lt CR gt MOVE W 800 FFFF06 lt CR gt MOVE W 07 FFFF10 lt CR gt MOVE W 210E FFFF12 lt CR gt MOVE W 0200 FFFF14 lt CR gt MOVE W 8F FFFF20 lt CR gt MOVE W 8000 FFFF24 lt CR gt MOVE W
12. So when the trans count value reached the max count value the start link channel field would receive a link signal and the link channel count field would receive the number of sequential channels If the start link channel field received the value 5 and the link channel count field received the value 3 link signals would go to destination channels 5 6 and 7 Paragraph 3 2 4 includes linking information with regard to destination channels M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS 3 2 4 Example 7 Output Compare OC Mode Output compare OC mode has two general roles 1 Generating a rising edge generating a falling edge or toggling at some programmable delay time 2 Upon receiving a link signal generating a square wave of a programmable period Figure 3 4 shows OC mode parameters Table 3 4 explains the values of the channel control parameter for this mode A channel in OC mode can receive link signals that is be a linking destination channel The 50 duty cycle square wave generation mode is covered in this example along with receiving link signals In Program 7 channel 0 is in PWM mode channel 1 is in ITC mode and channel 2 is in OC mode Channel 1 links to channel 2 Differences between Program 7 and previous programs involve these parameters for channel 2 The channel control register receives the value 008F This means that the TBS field value is 0100 which selects TCR1 The PAC field value is
13. and wait loop Line 664E Line 6652 Line 6656 Saves to register DS the final value in the trans count register Subtracting the initial reading from this reading yields the number of pulses during the wait loop Note that Program 6 sets up channel 1 to count pulses forever so the counter would overflow if the counting time were too long Wait loop creation entails loading the value 8000 into data register 6 then decrementing the value to 0000 Run the above program then abort Subtract the value in register D4 from the value in register D5 accounting for any values that roll over through 0000 The remainder is the number of pulses that occurred during the wait loop M68332EVKEM AD1 3 29 EXAMPLE PROGRAMS MOTOROLA 3 2 3 3 3 30 Linking The concept of linking already has been mentioned In order for two channels to be linked the first channel must be capable of generating a link signal and the second channel must be capable of receiving a link signal The operating modes of the channels determine these capabilities As mentioned earlier a channel in synchronized PWM mode ITC mode or period pulse width accumulator mode can generate a link signal This happens automatically when the trans count register value of such a channel equals or exceeds the max count register value In Example 6 for example channel 1 was in ITC mode The number of pulses channel 1 counted could be entered in max count register
14. bits 3 through 0 of channel function select register 3 CFS R3 at location FFFE12 Per Figure 3 1 the code for PWM mode is 9 so Program 1 writes the value 1001 to location FFFE12 The diagram below shows this value in CFS R3 Other bits of CFS R3 do not pertain to Example 1 For another example that also used channels 1 2 and 3 the corresponding program would have to load all bits of this register CFS R3 YFFE12 3 8 The program also must assign a priority value to the two bit channel priority field at register location FFFEIE Note that without a priority value the channel will not function In Example 1 Channel 0 has high priority so the channel priority field receives the value 11 3 Thus Program 1 writes the value 0003 to the SFFFEIE register To start the PWM mode the program must write the value for INITIALIZATION to the host service request field of host service request register 1 location FFFE1A Thus this register receives the value 10 2 This action starts a PWM wave that has a 50 percent duty cycle and a period of 4000 clock cycles To see the wave form connect an oscilloscope to the TPO pins pin 19 of PFB connector P2 and pin 46 of BCC connector P1 M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS Enter Program 1 below by typing in the bold characters Program 1 PWM Signal Generation CPU32Bug gt MM 6000 DI lt CR gt 6000 6008 6010 6018 6020 6028 6030 MOVE W
15. cannot generate host service requests Write the value 000F to the channel control register As table 3 2 indicates this value determines that the channel is an input and that either edge is detected Load the value 00 in the host sequence field of host sequence register 1 This determines that updates occur on transition If interrupts are to be used write the value 1 to the appropriate channel interrupt enable register Example 3 does not use interrupts and the power up restart presumed to precede all programs of this manual clears the channel interrupt register Accordingly Program 3 need not include any interrupt instruction Load the value 11 in the host service request register This determines that an interrupt will be generated when a rising edge is detected on the timer pin Program 3 sets up channel 0 to generate a square wave pulse and channel to sample the values of channel 0 Before running this program make sure to install a jumper between the TPO and 1 pins of connector 2 M68332EVKEM AD1 3 15 EXAMPLE PROGRAMS MOTOROLA Enter Program 3 below by typing in the bold characters Program 3 Discrete I O Mode Signal Generation and Sampling CPU321 6200 6208 6210 6218 6220 6228 6230 6238 6240 6248 624A 6252 6256 6258 625E 6262 6266 626A 6272 6274 627A 627C 6280 Bug gt MM 6200 DI lt CR gt MOVE W 92 SFFFF00 lt CR gt MOVE W 100 S
16. lt CR gt Enter memory display mode 5000 21FC0000 501C0078 OVE L 5501 78 W 5008 23FCO61E 012000FF FA22 MOVE L 5061 0120 FFFA22 5012 F80001C0 2500 LPSTOP W 52500 5018 6000FFF8 BRA W 5012 501C 307C5100 MOVEA W 55100 5020 327C510E MOVEA W S510E Al 5024 08390000 00 BTST B 50 SFFFCOC L 502C 67F6 BEQ B 5024 CPU32Bug gt lt CR gt Display next eight instructions 502E 13D800FF FCOF OVE B L 5034 B2C8 A0 A1 5036 6600FFEC BNE W 5024 503A 4E73 RTE 503C 0000FFFF ORI B SFF DO 5040 0000FFFF ORI B SFF DO 5044 0000FFFF ORI B SFF DO 5048 0000FFFF ORI B SFF DO To see the PIT output message enter the memory display command for the 5100 storage location CPU32Bug gt MD 5100 lt CR gt 00005100 5049 5420 5449 4D45 2D4F 5554 ODOA FFFF PIT TIME OUT M68332EVKEM AD1 3 3 EXAMPLE PROGRAMS MOTOROLA You may now experiment with the PIT program via the following commands ROUTINE TERMINAL DESCRIPTION CPU32Bug gt MD 5000 DI lt CR gt Display memory at address 5000 00005000 21FC0000 501C0078 MOVE L 5501 78 W 00005008 23FCO61E 012000FF FA22 MOVE L 5061 0120 FFFA22 00005012 80001 0 2500 LPSTOP W 52500 00005018 6000FFF8 BRA W 5012 0000501C 307C5100 MOVEA W 55100 0 00005020 327 510 MOVEA W 5510 00005024 08390000
17. select register This makes channel 1 operate in input capture mode and channel 0 operate in PWM mode Line 6520 Loads the value F in the channel priority register giving both channel 1 and channel 0 high priority Line 6528 Loads the value 0 in the host sequence field for channel 1 This determines single shot operation wihout linking Line 6530 Loads the value 4 in the host service request field This starts channel 1 looking for a rising edge Line 6538 These three lines form a loop that continues until channel 1 Line 653E detects a rising edge and interrupts Line 6542 Line 6546 Loads the value 1 in the channel interrupt status field to clear the channel interrupt flag Line 654E Saves to register D2 the value in the final trans time register This is the timer value when the previous rising edge occurred Line 6554 Loads the value B in the channel control register Per Table 3 3 this makes channel 1 an input that captures detecting falling edges Line 655C Loads the value 4 in the host service request field This starts channel 1 looking for a falling edge Line 6564 These three lines form a loop that continues until channel 1 Line 656A detects a falling edge and interrupts Line 656E Line 6572 Saves to register D3 the value in the final trans time register This is the timer value when the previous falling edge occurred Line 6578 Loads the value 1 in the channel interrupt status field to clear M6
18. 1
19. 2 Microcontroller Unit MCU and emphasizes the time processor unit TPU The MC68332 TPU is an MC68332 MCU internal module This manual contains several application programs and ends with a self test To complete the self test you many need to consult the manuals describing the MC68332 MCU device MC68332 User s Manual MC6832UM AD CPU32 Central Processor Unit Reference Manual CPU32RM AD M68300 Time Processor Unit Reference Manual TPURM AD 12 GENERAL DESCRIPTION The MC68332 is a 32 bit integrated microcontroller that combines data manipulation capabilities with peripheral subsystems The MC68332 is a member of the MC68300 family of modular embedded controllers to feature fully static high speed complementary metal oxide semiconductor HCMOS technology A subset of the MC68020 the CPU32 instruction processing module provides enhanced system performance and utilizes the extensive software base of the Motorola M68000 Family To perform the exercises in this manual you need the M68332EVK Evaluation Kit EVK or the M68332BCC Business Card Computer BCC When you mount the BCC on the PFB it becomes an M68332EVK Evaluation Kit EVK All references in this manual are to the EVK but you may use the BCC as a standalone board The EVK is a table top evaluation and emulation system shown in Figure 1 1 You may use the EVK to evaluate the MCU via user developed programs when attached to your target system the EVK emulates the MC
20. 8332EVKEM AD1 the channel 1 interrupt flag 3 27 EXAMPLE PROGRAMS MOTOROLA 3 2 32 Example 6 Counting Events This example illustrates another use for the ITC mode counting events For example boxes travelling down a conveyor may pass in front of an electric eye The ITC mode could issue an interrupt each time 25 boxes pass the electric eye and make available the number of boxes that passed the electric eye since the last interrupt signal Program 6 is such a counting program it uses channel to count the number of signal pulses that occur on channel 0 during a specified time The max count register is loaded with the number of events to be detected the program issues an interrupt each time it reaches this number The trans count register keeps track of the number of events that have occurred the software can access this register at any time The hardware setup for this example is the same as for Example 5 Use Program 5a to generate signal pulses that is to put channel 0 in the PWM mode and generate a 50 duty cycle square wave Next enter program 6 below by typing in the bold characters Program 6 Channel 50 Duty Cycle Square Wave CPU32Bug gt MM 6600 DI lt CR gt 6600 MOVE 6608 MOVE 6610 MOVE 6618 MOVE 6620 MOVE 6628 MOVE 6630 MOVE 7 SFFFF10 lt CR gt SE SFFFF12 lt CR gt SFFF SFFFF14 lt CR gt 5 9 SFFFE12 lt CR gt F SFFFELE lt CR gt 50 SFFFE16 lt CR gt 54 S
21. C Mode 01 LOW PRIORITY 10 M DDLE PRIORITY 11 HIGH PRIORITY 00 551 NGLE SHOT NO LINKS 01 CONTINUAL NO LINKS 10 51 NGLE SHOT LINKS 11 CONTINUAL LINKS 01 0 lt 1 INT TIALIZATION INTERRUPT ERRUPT 8 7 6 5 4 3 2 1 0 TPU does not perform checks on LINK CHANNEL COUNT value If LINK CHANNEL COUNT is greater than eight or equal to zero results are unpredictable COUNT should be between zero and FFFF If MAX COUNT equals zero the TPU counts one transition M68332EVKEM AD1 Figure 3 3 ITC Mode Parameters ADDRESSES FFFEOC FFFE12 FFFE1C FFFE1E FFFE14 FFFE16 FFFE18 FFFE1A FFFEOA FFFE20 3 23 EXAMPLE PROGRAMS M MOTOROLA Table 3 3 ITC Mode Channel Control Options TBS 8 7 6 0 0 x 000 00 1 3 2 3 1 5 x x x PAC o o 43 2 PSC Action 1 0 Input 11 Detect Rising Edge Detect Falling Edge Detect Either Edge Input Channel Capture TCR1 Capture TCR2 Do Not Detect Transition Do Not Change PAC Example 5 Square Wave Generation and Measurement This example illustrates one possible use of input capture mode First a program sets channel 0 to output a square wave with an arbitrary period Program 5a does this putting channel 0 in PWM mode A second program Program 5b then puts channel 1 in ITC mode to measure the wave output of channel 0 Enter P
22. FFFE1A lt CR gt 6638 MOVE W SFFFF16 D4 lt CR gt 663C SUB W 1 D6 lt CR gt 6644 BNE W 663C CR 664A MOVE W 8000 D6 lt CR gt 664E SUB W 1 D6 lt CR gt 6652 BNE W 6642 6656 MOVE W SFFFF16 D5 lt CR gt 665C BRA W 664A CR CPU32Bug GO 6600 CR 3 28 M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS Program 6 works in this way Line 6600 Loads the value 7 in the channel control register Per Table 3 3 this makes channel 1 an input that captures detecting rising edges Line 6608 Loads the value E in the blank address field This directs the bank address to unimplemented RAM Line 6610 Loads the value SFFF in the max count register Line 6618 Loads the value A9 in the channel select register This makes channel 1 operate in input capture mode and channel 0 operate in PWM mode Line 6620 Loads the value F in the channel priority register giving both channel 1 and channel 0 high priority Line 6628 Loads the value 0 in the host sequence field for channel 1 This determines single shot operation without linking Line 6630 Loads the value 4 in the host service request field This starts channel 1 looking for a rising edge Line 6638 Saves to register D4 the value in the trans count register Line 663C These two lines establish a time delay that lets the service request Line 6644 initialize the trans count regisiter Line 664A These three lines form a counter
23. FFFF04 lt CR gt MOVE W 200 FFFF06 lt CR gt MOVE W 89 SFFFE12 lt CR gt MOVE W SF SFFFE1LE lt CR gt MOVE W 2 SFFFE1LA lt CR gt MOVE W 7 SFFFF10 lt CR gt MOVE W 0 SFFFE16 lt CR gt MOVE W C SFFFE1LA lt CR gt CLR L D6 lt CR gt BCLR B 1 FFFE21 lt CR gt BEQ W 624A lt CR gt ADDQ L 1 D6 lt CR gt CMPI L 400 D6 lt CR gt BNE W 624A lt CR gt MOVEA W 7000 A0 lt CR gt MOVEA L 700C A1 lt CR gt BTST B 0 FFFCOC lt CR gt BEQ B 626A lt CR gt MOVE B 0 FFFCOF lt CR gt CMPA W 0 1 lt gt BNE W 626A lt CR gt BRA W 6248 lt CR gt After you enter Program 3 you must enter the ASCII code for the output message as in the PIT timeout example then run the program CPU321 CPU321 3 16 Bug gt MS 7000 1024 Edges ODOA lt CR gt Bug GO 6200 CR M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS Program 3 works in this way Line 6200 Loads the value 92 in the channel control register This makes the timer pin an output forced low upon generation of a host service request Line 6208 Loads the value 100 as the pulse period high time Line 6210 Loads the value 200 as the overall pulse period Line 6218 Loads the value 89 in the channel function select register This makes channel 0 operate in PWM mode and channel 1 operate in DIO mode Line 6220 Loads the value F in the channel priority fields to give both channel 0 and channel 1 high priority L
24. M68332EVKEM AD1 April 1999 M68332EVKEM EVALUATION KIT EXERCISE MANUAL MOTOROLA INC 1991 1999 Motorola reserves the right to make changes without further notice to any products herein to improve reliability function or design Motorola does not assume any liability arising out of the application or use of any product or circuit described herein neither does it convey any license under its patent rights nor the rights of others Motorola products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur Should Buyer purchase or use Motorola products for any such unintended or unauthorized application Buyer shall indemnify and hold Motorola and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part The computer program stored in the Read Only Memory of the device contains material copyrighted by Motorola Inc first published 1991 and may be used onl
25. OROLA EXAMPLE PROGRAMS CHAPTER 3 EXAMPLE PROGRAMS 31 INTRODUCTION To create modify and debug MC68332 MCU code enter the memory modify command That is type MM XXXX DI on the command line and press the carriage return CR As with all assembler input there must be exactly one space between the mnemonic and the operand There must be no space inside the operand field No comments are allowed after the instruction input and no line labels are permitted The DI option activates the one line assembler disassembler This is an interactive assembler editor for the source program As you enter each line of source code the assembler disassembler converts the line to machine language and stores it in memory The assembler disassembler disassembles the machine code of each instruction in order to display the instruction mnemonic and operands All valid opcodes are converted to assembly language mnemonic The contents of the specified memory location appear along with the prompt for input At this point you have three options Enter a carriage return CR Pressing the carriage return on an input line without other input closes the present location and continues with disassembly of the next instruction The instruction is unchanged Enter a new source instruction then press CR This activates the assembler to assemble the new instruction and generate disassembly of the object code generated The new source
26. Program 4 then terminated it at an arbitrary time by pressing the ABORT switch A manual read of the pin level register showed these results Sample 1 0COC 0000110000001100 Sample 2 3030 001 10000001 10000 Sample 3 4060 010000001 1000000 Sample 4 6060 260110000001 100000 Sample 5 0303 0000001100000011 Sample 6 50301 0000001100000001 Most of the samples show low time of 6 sample periods and high time of 2 sample periods Because the sample time in this case is only 2 times the frequency of the waveform being sampled there is some jitter as shown in sample 3 and sample 6 Note this final point about Program 4 Bits 3 and 2 of host service request register 1 received the value 9011 this started Channel 1 sampling Later the same register alternately received the values 0002 and 0001 to force the channel 0 output low and high respectively Although this means technically that bits 3 and 2 should receive the value 00 as part of those subsequent 0002 and 0001 values the original host service request to channel 1 does not change In other words once Program 4 starts the match mode this mode does not stop The host service request bits are cleared automatically when the user terminates the program M68332EVKEM AD1 3 21 EXAMPLE PROGRAMS MOTOROLA 3 2 3 3 22 Input Capture Input Transition Counter ITC Mode Input capture input transition counter ITC mode is important for counting events measu
27. This makes channel 2 an output that toggles on match Loads the value 80 in the ratio field This sets the calculation ratio to 80 FF or 50 Loads the value FE in the ref addr2 field This value points to parameter RAM location FFFFFE Loads the value 30 in parameter RAM location FFFFFE Loads the value 0EA9 in the channel function select register This means that channel 0 operates in PWM mode channel 1 operates in ITC mode and channel 2 operates in OC mode Loads the value 38 in the host sequence register The channel 1 host sequence field receives the value 10 which specifies single shot operation with linking The channel 2 host sequence field recieves the value 11 which specifies reading the TCR1 signal Loads the value 3F in the channel priority register giving all three channels high priority Loads the value 36 in the host service request register This initializes all three channels channel 2 with continuous pulses Branches to line 6700 to establish the program loop This completes this exercise manual The questionnaire of Appendix A is a convenient review of issues throughout the manual 3 36 M68332EVKEM AD1 MOTOROLA EXERCISE MANUAL QUESTIONNAIRE M68332EVKEM AD1 APPENDIX A EXERCISE MANUAL QUESTIONNAIRE Suppose that a channel is set up in PWM mode The PWMHI register contains the value 1000 and the PWMPER register contains the value 4000 Assuming a 2 usec period f
28. This resets MCU and RS 232C port circuitry and passes processing control to the monitor program This message appears on the terminal or PC screen CPU32Bug Debugger Diagnostics Version 1 00 C Copyright 1991 by Motorola Inc CPU32Bug gt The prompt CPU32Bug gt at the end of this message appears after any system initialization and any time the monitor program assumes processing control By itself in shows that the system is waiting for a command line or other user input The message Invalid command CPU32Bug gt indicates an incorrect user entry When the user enters a correct command debug operation continues in one of two basic modes If the command causes execution of a user program the monitor may or may not be reentered depending upon the desire of the user For the alternate case the command is executed under the control of the monitor and the system resumes waiting During command execution additional user input may be required depending on the command Chapter 3 of the M68CPU32BUG Debug Monitor User s Manual M68CPU32BUG D explains CPU32Bug commands The user can use any of the commands supported by the monitor A standard input routine controls the EVK operation while the user types a command line Command processing begins when the user presses the carriage return lt CR gt key at the end of the command line M68332EVKEM AD1 2 5 SYSTEM CONFIGURATION MOTOROLA 2 6 M68332EVKEM AD1 MOT
29. U This emulation functionality includes breakpoints trace functions memory and register display and modify commands system call routines and a diagnostic monitor M68332EVKEM AD1 1 1 GENERAL INFORMATION MOTOROLA MC68332 MCU RS 232C Connector EPROM M68332BCC Background Mode Connector Optional RAM or Connectors for DI Connectors for BCC RS 232C DI Connector RS 232C BCC Connector M68300PFB Figure 1 1 M68332EVK Evaluation Kit This manual lists the components and equipment required for EVK BCC operation Information on power and PC hookups a sample program for debugger experimenting and application programs also are in this manual 1 2 M68332EVKEM AD1 MOTOROLA GENERAL INFORMATION The EVK consists of two printed circuit boards PCBs and one software program M68332BCC Business Card Computer BCC PCB M68300PFB Platform Board M68CPU32BUG Debug Monitor CPU32Bug program To use the EVK you also need e 5 Vdc 200 mA power supply RS 232C cable e Terminal or personal computer PC You may use an IBM PC or compatible PC instead of a terminal but the PC must have a terminal emulation package For exercises of this manual use the default jumper settings from Table 1 1 ignore the PCB settings if using the BCC as a standalone board Table 1 1 BCC Jumper Settings
30. erent channels As mentioned above the ref addr2 value is part of the offset value calculation In Example 7 channel 15 is not used so any of its parameter RAM cells can be used Program 7 uses the eighth parameter at address FFFFFE This means that ref addr2 receives the value FE Before running Program 7 be sure to connect together the channel 0 and channel 1 timer pins TPO and TP1 This program sets up channel 0 to operate in PWM mode producing a periodic pulse train Channel 1 operates in ITC mode counting the pulses of channel 0 When channel 1 counts 200 pulses it sends a link signal to channel 2 Channel 2 operates in OC mode so it can receive the link signal Channel 2 outputs a square wave but does not start until it receives both a host service request from the CPU and the link signal from channel 1 M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS FIELD SIZE 3 2 1 0 oo E FFFFWO FFFFW2 FFFFW4 FFFFW6 FFFFW8 FFFFWA FFFFEC FFFFEE FIELD NAME CHANNEL FUNCTION SELECT FIELD CHANNEL PRIORITY FIELD HOST SEQUENCE FIELD HOST SERVICE REQUEST FIELD INTERRUPT ENABLE FIELD INTERRUPT STATUS FIELD 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 5 E 0C Mode 01 LOW PRIORITY 10 MIDDLE PRIORITY 11 HIGH PRIORITY 0x AND PULSES SCHEDULED 1 ONLY READ TCR1 TCR2 01 HOST INITIATED PULSE 11 INIT CONTINUOUS
31. gures the timing pin as an output and forces it high A 10 host service request also configures the timing pin as an output but forces it low The percent symbol indicates a binary value M68332EVKEM AD1 EXAMPLE PROGRAMS MOTOROLA FIELD SIZE FIELD NAME OPTIONS ADDRESSES CHANNEL FUNCTION SELECT FIELD 8 DIO Mode FFFEOC SFFFE12 CHANNEL PRIORITY FIELD 01 LOW PRIORITY FFFE1C FFFEIE 10 MIDDLE PRIORITY 11 HIGH PRIORITY HOST SEQUENCE FIELD 00 UPDATE ON TRANSITION FFFE14 FFFE16 01 UPDATE ON MATCH RATE RATE 10 UPDATE ON HSR 11 HOST SERVICE REQUEST FIELD 10 INITIALIZATION FFFE18 FFFE1A 01 SET PIN HIGH 11 SET PIN LOW INTERRUPT ENABLE FIELD 0 NO INTERRUPT FFFEOA 1 INTERRUPT INTERRUPT STATUS FIELD FFFE20 EH 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 FFFFW2 PIN LEVEL FFFFW4 MATCH RATE UPDATED BY CPU W CHANNEL NUMBER Figure 3 2 Discrete I O Mode Parameters 3 12 M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS TBS O0000 x oOooooo x O O x x O O x 5 876 Table 3 2 Discrete I O Mode Channel Control Options PAC PSC 432 10 11 000 00 1 010 011 1 Action Input Do Not Detect Transition Detect Rising Edge Detect Falling Edge Detect Either Edge Do Not Change PAC Input Channel Capture TCR1 Match TCR1 Capture TCR1 Compare TCR2 Capture TCR2 Compare 1 Capture TCR2 Compare TCR2 Do Not C
32. hange TBS Output Do Not Force Do Not Change PAC Do Not Change TBS Enter Program 2 below by typing in the bold characters Program 2 Discrete I O Mode Signal Generation CPU32Bug gt MM 6100 DI lt CR gt 100 108 10 18 120 124 128 12C 134 138 13C 140 OY OY OV OV ta L 107124 CPU321 MOVE W 8 SFFFE12 lt CR gt MOVE W 3 SFFFELE lt CR gt MOVE W 113 SFFFF00 lt CR gt MOVE W 1 SFFFE1A lt CR gt MOVE W SFF D0 lt CR gt SUB W 1 D0 lt CR gt BNE W 6124 lt CR gt MOVE W 2 SFFFE1LA lt CR gt MOVE W SFF D0 lt CR gt SUB W 1 D0 lt CR gt BNE W 6138 lt CR gt BRA W 6118 lt CR gt M68332EVKEM AD1 Bug gt GO 6100 lt CR gt 3 13 EXAMPLE PROGRAMS MOTOROLA 3 14 Program 2 works in this way Line 6100 Line 6108 Line 6110 Line 6118 Line 6120 Line 612C Line 6140 Loads the value 8 in channel function select field of channel control register This puts channel 0 in DIO mode Loads the value 3 in the channel priority field to give channel 0 high priority Loads the value 113 in the channel control register making channel 0 an output Host service request forces channel 0 high Starts wait loop Host service request forces channel 0 low Repeats program so software generates a square wave If you run Program 2 once no loop the pin level register bit 15 value should be 0 the bit
33. if we want to link four channels to the first the start link channel field specifies the first destination channel and the link channel count field contains the value 4 The eight bit bank address field points to another memory location This location is incremented each time a function is performed the number of times specified in the max count register The transaction count register is incremented each time the specified function is performed For example each time an input capture is made the memory location pointed to by bank address is incremented The final transaction time register contains the value of the TCR of the last transition That is when the transaction count is greater than or equal to the max count register the captured TCR value is written to the final transaction time register The last transition time register contains the value of the TCR from the most recent capture M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS FIELD SIZE B Br 1 15 14 13 12 11 10 9 FIELD NAME CHANNEL FUNCTION SELECT FIELD CHANNEL PRIORITY FIELD HOST SEQUENCE FIELD HOST SERVICE REQUEST FIELD INTERRUPT ENABLE FIELD INTERRUPT STATUS FIELD FFFFWO START LINK LINK CHANNEL CHANNEL COUNT 2 FFFFW4 FFFFW6 FFFFW8 FFFFWA L UPDATED BY CPU W CHANNEL NUMBER NOTES 1 MAX_COUNT and TRANS_COUNT should be accessed coherently and reside double word boundary N OPTIONS A IT
34. in a pulse train is from the TPU itself Program 1 puts channel 0 in pulse width modulation PWM mode providing a signal that other channels can use Example 2 discrete I O mode explains locations and uses of registers Note that each TPU channel has a set of parameter registers the purpose of these registers depends on the operating mode of the channel Figure 3 1 contains a diagram of these registers for any single channel in PWM mode The first thing Program 1 does is set up the parameter registers for channel 0 The parameter registers for channel 0 are from FFFFOO through FFFFOA Figure 3 1 shows that for channel 0 the channel control register is at FFFFOO the pulse width modulation high time PWMHI register is at SFFFF04 and the pulse width modulation period PWMPER register is at location FFFF06 The channel control register location SFFFF00 is the first parameter Program 1 configures Figure 3 1 and Table 3 1 detail the first 9 bits of this 16 bit register The pin state control PSC field forces a pin high or low or leaves the pin in its current state upon a write to the host service request register For Example 1 the PSC field value is 10 force pin low The pin action control PAC field does not pertain to this example The time base select TBS field determines the timer count register TCR1 or TCR2 In Example 1 we use TCRI so the TBS field value must be 0100 capture compare TCR1 Thus Program 1 wr
35. ine 6228 Loads the value 2 in the host service request field for channel 0 This starts the square wave output Line 6230 Loads the value 7 in the channel control register This directs channel 1 to detect rising edges Line 6238 Loads the value 0 in the host sequence field for channel 1 This directs the channel to update on transition Line 6240 Loads the value C in the host service request field for channel 1 This starts the timer looking for edges but there is no change in timer pin output until the first edge is detected Line 6248 Clears data register D6 for use in counting the number of edges detected Line 624A Tests the channel 1 interrupt flag sets the status register accordingly then clears the interrupt flag Line 6252 Loops back to the BCLR instruction until the test is TRUE that is an interrupt was generated Line 6256 Upon interrupt detection increments the edge count in D6 Line 6258 Tests the edge count in D6 against the edge count limit value 400 that is 1024 edges Line 625E Ifthe edge count is not yet 1024 branches back to line 624A If the edge count is 1024 falls through to next instruction Line 6262 Loads a pointer to the start of the output string Line 6266 Loads a pointer to the end of the output string Line 626A Start of display loop checks whether the serial controller is busy Line 6272 Waits for the serial controller if necessary Line 6274 Sends a character to the screen via the serial po
36. ites the value 0092 to location FFFFOO Next Program 1 loads the PWM high PWMHI and PWM period PWMPER registers The PWMHI value is the pulse period high time the PWMPER value is the overall pulse period The initial arbitrary values for this example are 2000 and 4000 respectively M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS FIELD SIZE FIELD NAME OPTIONS ADDRESSES CHANNEL FUNCTION SELECT FIELD 9 PWM Mode FFFEOC FFFE12 CHANNEL PRIORITY FIELD 01 LOW PRIORITY FFFE1C FFFE1E 10 MIDDLE PRIORITY 11 HIGH PRIORITY HOST SEQUENCE FIELD NOT USED FFFE14 SFFFE16 HOST SERVICE REQUEST FIELD 10 INITIALIZATION FFFE18 FFFE 1A 01 IMMEDIATE UPDATE OF PWM INTERRUPT ENABLE FIELD 0 NO INTERRUPT FFFEOA 1 INTERRUPT INTERRUPT STATUS FIELD FFFE20 15 14 13 12 1 10 9 8 7 6 5 4 3 2 1 0 C UPDATED BY CPU W CHANNEL NUMBER NOTES 1 Best case minimum for PWMHI is 32 system clocks 2 Best case minimum for PWMPER is 48 system clocks 3 PWMHI and PWMPER must be accessed coherently Figure 3 1 PWM Mode Parameters M68332EVKEM AD1 3 7 EXAMPLE PROGRAMS MOTOROLA Table 3 1 PWM Mode Channel Control Options Force pin as Specified by PAC Latches Force pin High Force pin Low Do Not Force Any State Output Channel Capture TCR1 Compare 1 Capture TCR2 Compare TCR2 The next task for Program 1 is to load the channel function select field for Channel 0 This field consists of
37. line replaces the current line e Enter then press CR Terminate the assembler disassembler by entering only a period on the command input line then pressing the carriage return After each new assembler input line the new line is disassembled for the user before stepping to the new instruction The new line may assemble to a different number of bytes than the previous one 1 In this manual all user input is in bold upper case CPU32Bug accepts lower case input as well M68332EVKEM AD1 3 1 EXAMPLE PROGRAMS MOTOROLA 3 2 The next few pages show how to operate the assembler disassembler First you will create a typical program loop Then you will use CPU32BUG monitor commands to debug the program The routine examples illustrate how to display memory change memory set a breakpoint and start user program execution Power up fills all user memory space with an alternating pattern of 0 and F characters To see this pattern enter the memory display command CPU32Bug gt MD 5000 DI lt CR gt 5000 5004 5008 500C 5010 501 501 501 CPU321 5000 5008 5012 5018 501C 5020 5024 502C 502E 5034 5036 503A CPU321 0000FFFF ORI B SFE DO 0000FFFF ORI B SFE DO 0000FFFF ORI B SFE DO 0000FFFF ORI B SFE DO 0000FFFF ORI B SFE DO 0000FFFF ORI B SFE DO 0000FFFF ORI B SFE DO 0000FFFF ORI B SFE DO Now program the EVK
38. n command The microengine reads the value of the timer pin shifts bits 15 1 of the pin level register one place to the right and copies the present value of the timer pin to bit 15 of the pin level register Thus reading bit 15 of the pin level register shows the current state of the timer pin reading bits 14 through 0 shows the previous 15 states of the timer pin Programming the timer system to generate an interrupt or other host service request to the microengine upon a specified transition low to high or high to low of an output timer pin The microengine reads the value of the timer pin shifts bits 15 1 of the pin level register one place to the right and copies the present value of the timer pin to bit 15 of the pin level register Thus reading the pin level register shows the 16 most recent state transitions of the timer pin Configuring a timer pin as an input This lets timer pin values be sampled that is read at the rate specified in the match rate register in timer clock cycles Each time the microengine samples the pin value the microengine shifts bits 15 1 of the pin level register one place to the right and copies the present value of the timer pin to bit 15 of the pin level register This use approximates a receive channel of a universal asynchronous receiver transmitter sampling an incoming signal at a periodic rate storing values in the pin level register Examples 2 3 and 4 with their correspo
39. nding programs illustrate these uses of the DIO mode M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS 3 2 2 1 Example 2 Turn on and off a load Turning on or off an electrical load such as a light bulb or motor relay is an exercise in forcing a timer pin high or low on command This is an appropriate job for the DIO mode Program 2 must perform these actions to invoke DIO mode 1 Load the value 8 in the channel function select field of the appropriate channel function select register Figure 3 2 illustrates the channel function select field and other DIO mode parameters Load a priority value in the channel priority field of the appropriate channel priority register Note that there is no default priority if the program does not load a priority value the channel cannot generate a host service request Write the value 113 to the channel control register As Table 3 2 indicates this value determines that no output is forced and that no changes are made to the pin action control PAC and time base select TBS fields If interrupts are to be used write the value 1 to the appropriate channel interrupt enable register Example 2 does not use interrupts and the power up restart presumed to precede all programs of this manual clears the channel interrupt register Accordingly Program 2 need not include any interrupt instruction Once the program carries out these actions a 01 host service request confi
40. ntrol Program 4 generates the channel 0 output by forcing the TPO pin high for 50 microseconds then low for 150 microseconds 3 18 M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS Enter Program 4 below by typing in the bold characters Program 4 Discrete I O Mode Match Rate Signal Generation M68332EVKEM AD1 CPU321 6300 6308 6310 6318 6320 6328 6330 6338 6340 6344 6348 634C 6354 6358 635C 6360 6366 CPU321 Bug gt MM 6300 DI CR MOVE W 588 SFFFE12 lt CR gt MOVE W 4 SFFFE16 lt CR gt MOVE W SF 1 lt gt MOVE W 113 SFFFFO0 lt CR gt MOVE W 3 SFFFF10 lt CR gt MOVE W SD SFFFF14 lt CR gt MOVE W 0C FFFE1A lt CR gt MOVE W 2 SFFFE1A lt CR gt MOVE W A9 DO lt CR gt SUB W 1 D0 lt CR gt BNE W 6344 lt CR gt MOVE W 1 SFFFE1A lt CR gt MOVE W 33 D0 lt CR gt SUB W 1 D0 lt CR gt BNE 6358 lt CR gt MOVE W FFFF12 D1 CR BRA 6338 CR Bug GO 6300 lt CR gt 3 19 EXAMPLE PROGRAMS MOTOROLA Line 6300 Line 6308 Line 6310 Line 6318 Line 6320 Line 6328 Line 6330 Line 6338 Line 6340 Line 6344 Line 6348 Line 634C Line 6354 Line 6358 Line 635C Line 6360 Line 6366 Program 4 works in this way Loads the value 88 in the channel function select register This makes channels 0 and 1 operate in DIO mode Loads the value 4 in the host sequence register This makes channel 1 update a
41. or the TPU clock what is the duty cycle in percent and the period of the pulse 10 5000 usec b 20 10 000 usec c 25 8000 usec d 40 8000 usec Suppose Program 2 page 3 12 repeats eight times 16 host service requests What pattern would be in the pin level register a 11111111 11111111 b 0000 0000 0000 0000 1111 0000 11110000 0101 0101 0101 0101 Suppose that the pin level register contains the value 0011111000000000 and the match rate register contains the value 2 What is the high time of the incoming signal in clock periods a 5 b 10 25 d 32 Suppose that the max count register contains the value 0F How many pulses must be counted before an interrupt flag is set a 4 b 10 c 15 d 25 Suppose that a channel is set up to generate a square wave using the OC mode as shown in Program 7 The ratio value is set to 80 The period of the square wave is approximately 100 usec What will the period be if the ratio value is changed to 40 a 40 usec b 50 usec c 75 psec d 200 usec A 1 EXERCISE MANUAL QUESTIONNAIRE MOTOROLA Questionnaire Answers A 2 The answers to the questions are below If you answered a question incorrectly you should review the material at the indicated pages 1 2 4 3 b 4 5 b pages 3 6 through 3 9 pages 3 10 through 3 14 pages 3 18 through 3 21 pages 3 22 through 3 30 pages 3 31 through 3 36 M68332EVKEM AD
42. ring time intervals and generating time intervals Particular ITC mode capabilities are e Capturing each specified event of a selected TCR such as a rising edge a falling edge or either edge Counting a set number of negative positive or any transitions then generating an interrupt When a channel in input capture mode captures the set number of events the TPU can start the functioning of as many as eight other channels This ability involves linking For two channels to be linked the activating channel generates a link signal to the activated channel Channels in synchronized PWM mode ITC mode or period pulse width accumulator mode can generate link signals Channels in synchronized PWM mode or output compare mode can be destination channels that is receive link signals Figure 3 3 shows ITC mode parameters The contents of the channel control register determine whether the first channel captures a selected edge or edges Table 3 3 explains the values of this parameter The start link channel field specifies the next channel to be activated when the first channel finishes its task That is the start link channel field specifies the destination channel for a link signal from the first channel Any channel in synchronized PWM or output compare modes can be this destination channel The link channel count field specifies the total number of additional destination channels Destination channels are in sequential order For example
43. rogram 5a below by typing in the bold characters Program 5a ITC Mode Square Wave Generation CPU321 6400 6408 641 64 64 64 64 CPU321 3 24 0 18 120 128 130 Bug gt MM 6400 DI lt CR gt BRA W 82 SFFFF00 lt CR gt 100 SFFFF04 lt CR gt 5200 SFFFF06 lt CR gt 59 SFFFE12 lt CR gt 3 lt gt 22 FFFE1A CR 6430 lt CR gt Bug gt GO 6400 lt CR gt M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS Program 5a works in this way Line 6400 Loads the value 82 in the channel control register This makes the channel 0 timer pin an output forced low upon generation of a host service request is generated Line 6408 Loads the value 100 as the pulse period high time Line 6410 Loads the value 200 as the overall pulse period Line 6418 Loads the value 9 in the channel function select register making channel 0 operate in PWM mode Line 6420 Loads the value 3 in the channel priority field to give channel 0 high priority Line 6428 Loads the value 22 in the host service request field for channel 0 This starts the square wave output Now that the TPU is generating a periodic wave form on Channel 0 we use channel 1 to measure the wave Program 5b does this putting channel 1 in input capture mode Program 5b or the user must perform therse actions 1
44. rt M68332EVKEM AD1 3 17 EXAMPLE PROGRAMS MOTOROLA Line 627A Checks whether the character just sent was the last one of the string Line 627 If last character not yet displayed branches back to line 626A If last character displayed falls through to next instruction Line 6280 Branches back to line 6248 to clear the edge count register and repeat the entire process 3 2 2 3 Example 4 Match Rate Sampling Another use of the DIO mode is sampling the value of an input timer pin at the periodic rate determined by the match rate register This is called match rate sampling or match mode The EVK clock input frequency is 16 777 Mhz The divide by 32 timer prescalar yields a TPU clock period of 1 92 microseconds This means that the fastest TPU sample rate for a single channel is about 500K samples per second Via the divide by 4 prescalar a timer channel can be sampled at about 4M samples per second As already mentioned when the TPU samples a timer pin on a particular channel the TPU records the digital value in the pin level register for the channel This entails shifting the contents of the pin level register one place to the right then writing the new value to bit 15 Thus the pin level register is a record of the 16 most recent samples Program 4 illustrates match rate sampling on the channel 0 output of Program 2 Program 2 used the DIO mode to generate an output by forcing a pin high and low under program co
45. t the specified match rate Loads the value F in the channel priority fields to give both channel 0 and channel 1 high priority Loads the value 113 in the channel control register making channel 0 an output Loads the value 3 in the channel control register This sets channel 1 to capture that is sample at the match rate Loads the value D in the match rate register This sets the match rate to D clock periods 26 8 usec Loads the value 0C in the host service request register starting channel 1 sampling Loads the value 2 in the host service request register forcing TPO low These three lines form a 50 usecond wait loop Loads the value 1 in the host service request register forcing high These three lines form a 150 wait loop Copies the contents of the pin level register into register D1 that is reads the pin level register Branches back to line 6338 to start the next cycle of the wave form M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS Program 4 generates this wave form 0 50 100 150 200 MICROSECONDS The sample rate is 13 TPU clock periods or each 25 microseconds Sampling twice every 50 microseconds guarantees that each 50 microsecond high pulse is sampled at least once Each 16 sample window should yield four high values and 12 low values a pattern such as 001 10000001 10000 or 0110000001 100000 During testing factory personnel ran
46. ut serial format for the I O port must be configured for 8 data bits 1 stop bit no parity and 9600 baud NC DSR RXD NC TXD CTR DTR NC GND PFB P9 BCC Terminal PC I O Port 2 2 M68332EVKEM AD1 MOTOROLA SYSTEM CONFIGURATION PFB P9 DB 9 MALE NOTE Some serial communication cards need CTS DSR DCD and DTR to be shorted together before they will function properly with the EVK Make this modification to the PC side of the cable DB 25 Figure 2 2 RS 232C Terminal PC Cable Assembly M68332EVKEM AD1 2 3 SYSTEM CONFIGURATION MOTOROLA 2 3 POWER CONNECTION Use PFB connector P7 to connect power to the EVK Contact 1 is GND black lever Contact 2 is 5 volts red lever Use 20 or 22 AWG wire for power connections For each wire trim back the insulation 1 4 in 635 cm lift the appropriate lever of P7 to release tension on the contacts then insert the bare wire into P7 and close the lever CAUTION Do not use wire larger than 20 AWG in connector P7 Such wire could damage the connector Turn off PFB power when installing the BCC on the PFB or removing the BCC from the PFB Sudden power surges could damage EVK integrated circuits 2 4 M68332EVKEM AD1 MOTOROLA SYSTEM CONFIGURATION 2 4 POWER UP After jumper settings are correct the EVK is in software debug configuration and the terminal or PC and power are connected you may turn on power to the EVK
47. with the periodic interrupt timer PIT time out program Starting at address 5000 enter this program as follows EXAMPLE PROGRAM PROGRAM DESCRIPTION Bug gt MM 5000 DI lt CR gt Enter memory modify command with disassembly option for location 5000 MOVE L 501 78 lt CR gt Set up level six vector table MOVE L 061E0120 SFFFA22 lt CR gt Initialize PIT LPSTOP 2500 lt CR gt Execute LPSTOP Instruction BRA W 5012 lt CR gt Loop MOVEA W 5100 A0 lt CR gt Beginning of message MOVEA W 510E A1 lt CR gt End of message BTST B 50 SFFFCOC lt CR gt Check for SCI not busy BEQ B 5024 lt CR gt Branch until free MOVE B 0 lt gt Send message byte CMPA W A1 lt CR gt Check for end of message BNE W 5024 lt CR gt Branch until done RTE lt CR gt Return from print routine After entering this program you must enter the ASCII code for the output message PIT TIME OUT When you run the program this message appears each time the program completes a loop Enter this ASCII code at memory location 5100 Bug gt MS 5100 PIT ODOA lt CR gt Modify memory at location 5100 M68332EVKEM AD1 MOTOROLA EXAMPLE PROGRAMS After entering the PIT timeout program you may display the instructions at location 5000 EXAMPLE PROGRAM PROGRAM DESCRIPTION CPU32Bug gt MD 5000 DI
48. y under a license such as the License For Computer Programs Article 14 contained in Motorola s Terms and Conditions of Sale Rev 1 79 MOTOROLA CONTENTS CONTENTS CHAPTER 1 GENERAL INFORMATION DI INERODUCTION un 1 1 12 GENERAL DESCRIPTION ananassa 1 1 2 SYSTEM CONFIGURATION DAY INTRODUCTION uuu s QU b ER RU dt beoe 2 1 22 TERMINAL PERSONAL COMPUTER CONNECTION 2 2 23 5 2 ARR 2 4 24 POWER UP s UTR itas aU im si 2 5 CHAPTER 3 EXAMPLE PROGRAMS SJ INTRODUCTION R s Drap dodi reactance M Gm eid 3 1 32 APPLICATION PROGRAMS 3 6 32 Example 1 Generating 5 Phase Locked Square Waves 3 6 352222 Dasesete VO se ua nn estais melee 3 10 3 2 2 1 Example 2 Turn and off a load 3 11 32 22 Example 3 Event Detection oos eed e cotes pa d aie 3 15 3 2 2 3 Example 4 Match Rate Sampling 3 18 3 2 3 Input Capture Input Transition Counter ITC 3 22 3 2 3 Example 5 Square Wave Generation and 3 24 3 2 3 2 Example 6
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