M16C User Manual.pdf

A-D ConverterMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTER(3) Single sweep modeIn single sweep mode, the pins selected using the A-D sweep pin select bit are used for one-by-one A-Dconversion. Table 1.20.4 shows the specifications of single sweep mode. Figure 1.20.6 shows the A-Dcontrol register in single sweep mode.Table 1.20.4. Single sweep mode specificationsItemSpecificationFunctionThe pins selected by the A-D sweep pin select bit are used for one-by-one A-D conversionStart conditionWriting “1” to A-D converter start flagStop condition• End of A-D conversion (A-D conversion start flag changes to “0”, exceptwhen external trigger is selected)• Writing “0” to A-D conversion start flagInterrupt request generation timing End of A-D conversionInput pinAN0 and AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins), or AN0 to AN7 (8 pins)Reading of result of A-D converter Read A-D register corresponding to selected pinA-D control register 0 (Note)b7 b6 b5 b4 b3 b2 b1 b01 0Symbol Address When resetADCON0 03D616 00000XXX2Bit symbol Bit name FunctionCH0 Analog input pinselect bitInvalid in single sweep modeCH1CH2MD0MD1TRGADSTCKS0A-D operation modeselect bit 0Trigger select bitA-D conversion start flagFrequency select bit 0b4 b31 0 : Single sweep mode0 : Software trigger1 : ADTRG trigger0 : A-D conversion disabled1 : A-D conversion started0 : fAD/4 is selected1 : fAD/2 is selectedNote: If the A-D control register is rewritten during A-D conversion, the conversion resultis indeterminate.R WA-D control register 1 (Note 1)b7 b6 b5 b4 b3 b2 b1 b010Symbol Address When resetADCON1 03D716 0016Bit symbolSCAN0SCAN1MD2BITSCKS1VCUTOPA0OPA1Bit nameA-D sweep pin select bitA-D operation modeselect bit 18/10-bit mode select bitFrequency select bit 1Vref connect bitExternal op-ampconnection modebit (Note 2)Figure 1.20.6. A-D conversion register in single sweep modeFunctionWhen single sweep and repeat sweep mode 0are selectedb1 b00 0 : AN0, AN1 (2 pins)0 1 : AN0 to AN3 (4 pins)1 0 : AN0 to AN5 (6 pins)1 1 : AN0 to AN7 (8 pins)0 : Any mode other than repeat sweep mode 10 : 8-bit mode1 : 10-bit mode0 : fAD/2 or fAD/4 is selected1 : fAD is selected1 : Vref connectedb7 b60 0 : ANEX0 and ANEX1 are not used0 1 : ANEX0 input is A-D converted1 0 : ANEX1 input is A-D converted1 1 : External op-amp connection modeR WNote 1: If the A-D control register is rewritten during A-D conversion, the conversion resultis indeterminate.Note 2: Neither ‘01’ nor ‘10’ can be selected with the external op-amp connection mode bit.159