A/D Converter Operation (Repeat Sweep Mode 0)
Contents
1. the input voltage applied to the AN_O pin is A D converted 2 After the A D conversion is completed on the AN_O pin the conversion result the contents of the successive conversion register is transferred to the ADOO register Then the input voltage applied to the selected analog input pins AN_1 to AN_7 is successively A D converted The conversion result is transferred to the corresponding AD0Oi register each time A D conversion is completed on the selected pin i 0 to 7 3 After A D conversion is completed on all selected analog input pins the A D converter successively restarts from the AN_0O pin The IR bit in the ADOIC register does not become interrupt requested 4 The A D converter does not stop operating until the ADST bit is set to 0 A D convention stopped by a program Figure 3 1 shows an Operation Example in Repeat Sweep Mode 0 1 A D conversion started input voltage applied to the AN_O pin is A D converted 2 After A D conversion of the AN_O pin is completed A D conversion of the AN_1 pin starts i 3 After A D conversion of all the selected analog input pins is completed A D conversion restarts from the AN_O pin 4 A D conversion is completed 1 33 cycles 1 i 33 cycles 33 cycles i 33 cycles H e a lt gt vo TUITE ADST bit in the ADOCONO register 1 H i i H i 0 i i i Set to 0 by a progrant ADOO register Conversion result H i Conversion result A D conversion result of2. Renesas Electronics product is Standard unless otherwise expressly specified in a Renesas Electronics data sheets or data books etc Standard Computers office equipment communications equipment test and measurement equipment audio and visual equipment home electronic appliances machine tools personal electronic equipment and industrial robots High Quality Transportation equipment automobiles trains ships etc traffic control systems anti disaster systems anti crime systems safety equipment and medical equipment not specifically designed for life support Specific Aircraft aerospace equipment submersible repeaters nuclear reactor control systems medical equipment or systems for life support e g artificial life support devices or systems surgical implantations or healthcare intervention e g excision etc and any other applications or purposes that pose a direct threat to human life 8 You should use the Renesas Electronics products described in this document within the range specified by Renesas Electronics especially with respect to the maximum rating operating supply voltage range movement power voltage range heat radiation characteristics installation and other product characteristics Renesas Electronics shall have no liability for malfunctions or damages arising out of the use of Renesas Electronics products beyond such specified ranges 9 Although Renesas Electronics endeavors to improve the quality and
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5. al News The latest information can be downloaded from the Renesas Electronics website C Compiler Manual R32C 100 Series C Compiler Package V 1 02 C Compiler User s Manual Rev 2 00 The latest version can be downloaded from the Renesas Electronics website Website and Support Renesas Electronics website http www renesas com Inquiries http www renesas com inquiry REJ05B1413 0100 Rev 1 00 stENESAS Page 4 of 4 Aug 31 2010 R32C 100 Series REVISION HISTORY A D Converter Operation Repeat Sweep Mode 0 Description Rev Date Aug 31 2010 edition issued All trademarks and registered trademarks are the property of their respective owners A 1 General Precautions in the Handling of MPU MCU Products The following usage notes are applicable to all MPU MCU products from Renesas For detailed usage notes on the products covered by this manual refer to the relevant sections of the manual If the descriptions under General Precautions in the Handling of MPU MCU Products and in the body of the manual differ from each other the description in the body of the manual takes precedence 1 Handling of Unused Pins Handle unused pins in accord with the directions given under Handling of Unused Pins in the manual The input pins of CMOS products are generally in the high impedance state In operation with an unused pin in the open circuit state extra electromagnetic noise is induced in the vicinity of LSI an asso
6. ciated shoot through current flows internally and malfunctions occur due to the false recognition of the pin state as an input signal become possible Unused pins should be handled as described under Handling of Unused Pins in the manual 2 Processing at Power on The state of the product is undefined at the moment when power is supplied The states of internal circuits in the LSI are indeterminate and the states of register settings and pins are undefined at the moment when power is supplied In a finished product where the reset signal is applied to the external reset pin the states of pins are not guaranteed from the moment when power is supplied until the reset process is completed In a similar way the states of pins in a product that is reset by an on chip power on reset function are not guaranteed from the moment when power is supplied until the power reaches the level at which resetting has been specified 3 Prohibition of Access to Reserved Addresses Access to reserved addresses is prohibited The reserved addresses are provided for the possible future expansion of functions Do not access these addresses the correct operation of LSI is not guaranteed if they are accessed 4 Clock Signals After applying a reset only release the reset line after the operating clock signal has become stable When switching the clock signal during program execution wait until the target clock signal has stabilized When the clock sig
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9. e 1 Select AN_0 and AN_7 Select mode other than repeat sweep mode 1 10 bit mode selected VREF connected Set A DO control register 2 A D conversion method with sample and hold function Set A DO control register 3 Frequency selected See Note 1 DMAC operating mode disabled Multi port sweep mode disabled Set A DO control register 4 Multi port sweep mode disabled Set the VCUT bit in the ADOCON1 register to 1 VREF connected and wait for at least 1 us Then set the ADST bit in the ADOCONO register to 1 A D conversion started When DMAC operating mode is disabled the IR bit does not become 1 A D conversion started 1 Operating clock AD is selected from a combination of the CKSO bit in the ADOCONO register the CKS1 bit in the ADOCON1 register and the CKS2 bit in the ADOCONS3 register For more details refer to the hardware user s manuals Figure 3 2 Setting Procedure of Repeat Sweep Mode 0 REJ05B1413 0100 Rev 1 00 Aug 31 2010 stENESAS Page 3 of 4 R32C 100 Series A D Converter Operation Repeat Sweep Mode 0 4 Sample Program A sample program can be downloaded from the Renesas Electronics website 5 Reference Documents User s Manuals R32C 118 Group User s Manual Hardware Rev 1 00 R32C 117 Group User s Manual Hardware Rev 1 00 R32C 116 Group User s Manual Hardware Rev 1 00 The latest versions can be downloaded from the Renesas Electronics website Technical Update Technic
10. nal is generated with an external resonator or from an external oscillator during a reset ensure that the reset line is only released after full stabilization of the clock signal Moreover when switching to a clock signal produced with an external resonator or by an external oscillator while program execution is in progress wait until the target clock signal is stable 5 Differences between Products Before changing from one product to another i e to one with a different part number confirm that the change will not lead to problems The characteristics of MPU MCU in the same group but having different part numbers may differ because of the differences in internal memory capacity and layout pattern When changing to products of different part numbers implement a system evaluation test for each of the products Notice 1 All information included in this document is current as of the date this document is issued Such information however is subject to change without any prior notice Before purchasing or using any Renesas Electronics products listed herein please confirm the latest product information with a Renesas Electronics sales office Also please pay regular and careful attention to additional and different information to be disclosed by Renesas Electronics such as that disclosed through our website 2 Renesas Electronics does not assume any liability for infringement of patents copyrights or other intellectual
11. rCENESAS APPLICATION NOTE R32C 100 Series REJ05B1413 0100 A D Converter Operation Repeat Sweep Mode 0 Rev 1 00 Aug 31 2010 1 Abstract This document describes how to use repeat sweep mode 0 In repeat sweep mode 0 repeated A D conversion is performed on the input voltage of pins selected from the following AN_0 to AN_7 ANO_0 to ANO_7 AN2_0 to AN2_7 and AN15_0 to AN15_7 2 Introduction The application example described in this document applies to the following microcomputers MCUs MCUs R32C 118 Group R32C 117 Group and R32C 116 Group This program can be used with other R32C 100 Series MCUs which have the same special function registers SFRs as the above groups Check the manuals for any modifications to functions Careful evaluation is recommended before using the program described in this application note REJ05B1413 0100 Rev 1 00 stENESAS Page 1 of 4 Aug 31 2010 R32C 100 Series A D Converter Operation Repeat Sweep Mode 0 3 Application Example This application example describes how to perform repeated A D conversion in repeat sweep mode 0 on the input voltage of pins AN_0 to AN_7 e Operation clock AD fAD divided by 2 Resolution 10 bit precision e A D conversion start condition software trigger e A D conversion method with sample and hold function e DMAC operating mode disabled 3 1 Explanation 1 When setting the ADST bit in the ADOCONDO register to 1 A D conversion started
12. the AN_0 pin i H j ADO1 register Y Conversion result A D conversion result of the AN_1 pin i A D conversion result of the AN_2pin ADO07 register y A D conversion result of the AN_7 pin 3 pc es Note 1 Number of cycles with sample and hold function 10 bit resolution Without sample and hold function 10 bit resolution 59 cycles With sample and hold function 8 bit resolution 28 cycles Without sample and hold function 8 bit resolution 49 cycles Figure 3 1 Operation Example in Repeat Sweep Mode 0 REJ05B1413 0100 Rev 1 00 stENESAS Page 2 of 4 Aug 31 2010 R32C 100 Series A D Converter Operation Repeat Sweep Mode 0 3 2 Settings This section shows the setting procedure and setting values to execute 3 1 Explanation Refer to the hardware user s manuals for details of each register Start of setting Disable maskable interrupts SetPLLClock ADOCONO lt 98h ADOCON1 2Bh ADOCON2 lt Oth ADOCONS lt 00h ADOCON4 00h Use P10 as A D converter input Wait for 1 us Set the interrupt priority level to 0 Enable maskable interrupts End of setting ADST_ADOCONO lt 1 Note Set A DO control register 0 Frequency selected See Note 1 A D operating mode repeat sweep mode 0 Set A DO control register 1 Frequency selected See Not
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