M16C User Manual.pdf

A-D ConverterMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERSelecting sample and holdb7b01A-D control register 2 [Address 03D416]ADCON2A-D conversion method select bit1 : With sample and holdSetting A-D control register 0 and A-D control register 1b70 1 0 0b0A-D control register 0 [Address 03D616]ADCON0Analog input pin select bit (Note)b2 b1 b00 0 0 : AN0 is selected0 0 1 : AN1 is selected0 1 0 : AN2 is selected0 1 1 : AN3 is selected1 0 0 : AN4 is selected1 0 1 : AN5 is selected1 1 0 : AN6 is selected1 1 1 : AN7 is selectedOne-shot mode is selected (Note)Trigger select bit1 : ADTRG triggerA-D conversion start flag0 : A-D conversion disabledFrequency select bit 00 : fAD/4 is selected1 : fAD/2 is selectedb70 0 1 0Note: Rewrite to analog input pin select bit after changing A-D operation mode.b0A-D control register 1 [Address 03D716]ADCON1Invalid in one-shot modeA-D operation mode select bit 1 (Note)0 (Must always be “0” in one-shot mode)8/10-bit mode select bit0 : 8-bit mode1 : 10-bit modeFrequency select bit 10 : fAD/2 or fAD/4 is selected1 : fAD is selectedVref connect bit1 : Vref connectedExternal op-amp connection mode bitb7 b60 0 : ANEX0 and ANEX1 are not usedSetting A-D conversion start flagb71b0A-D control register 0 [Address 03D616]ADCON0A-D conversion start flag1 : A-D conversion startedWhen ADTRG pin level becomes from “H” to “L”Start A-D conversionReading conversion result(b15)(b8)b7b0 b7b0A-D register 0 [Address 03C116, 03C016] AD0A-D register 1 [Address 03C316, 03C216] AD1A-D register 2 [Address 03C516, 03C416] AD2A-D register 3 [Address 03C716, 03C616] AD3A-D register 4 [Address 03C916, 03C816] AD4A-D register 5 [Address 03CB16, 03CA16] AD5A-D register 6 [Address 03CD16, 03CC16] AD6A-D register 7 [Address 03CF16, 03CE16] AD7Eight low-order bits of A-D conversion resultDuring 10-bit modeTwo high-order bits of A-D conversion resultDuring 8-bit modeWhen read, the content is indeterminateSetting A-D conversion start flagb70b0A-D control register 0 [Address 03D616]ADCON0A-D conversion start flag0 : A-D conversion disabledStop A-D conversionFigure 2.7.8. Set-up procedure of one-shot mode, with an external trigger selected391