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R8C/20 Datasheet(PDF) 377 Page - Renesas Technology Corp |
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R8C/20 Datasheet(HTML) 377 Page - Renesas Technology Corp |
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377 / 501 page  R8C/20 Group, R8C/21 Group 18. A/D Converter Rev.2.00 Aug 27, 2008 Page 361 of 458 REJ09B0250-0200 Figure 18.1 Block Diagram of A/D Converter Comparator AVSS Data bus øAD Resistor ladder VCUT = 0 VCUT = 1 VREF Successive conversion register AD register ADCON0 Vcom VIN P1_0/AN8 CH2 to CH0 = 100b P1_1/AN9 CH2 to CH0 = 101b P1_2/AN10 CH2 to CH0 = 110b P1_3/AN11 CH2 to CH0 = 111b ADGSEL0 = 1 CH0 to CH2, ADGSEL, CKS0: Bits in ADCON0 register CKS1, VCUT: Bits in ADCON1 register A/D conversion rate selection ADGSEL0 = 0 ADCAP = 1 Software trigger Timer RD interrupt request ADCAP = 0 Trigger P0_7/AN0 CH2 to CH0 = 000b P0_6/AN1 CH2 to CH0 = 001b P0_5/AN2 CH2 to CH0 = 010b P0_4/AN3 CH2 to CH0 = 011b P0_3/AN4 CH2 to CH0 = 100b P0_2/AN5 CH2 to CH0 = 101b P0_1/AN6 CH2 to CH0 = 110b P0_0/AN7 CH2 to CH0 = 111b Decoder CKS0 = 1 CKS1 = 1 CKS1 = 0 CKS0 = 0 f2 f4 CKS0 = 0 fOCO-F f1 CKS0 = 1 |
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