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M37151M6 Datasheet(PDF) 46 Page - Renesas Technology Corp |
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M37151M6 Datasheet(HTML) 46 Page - Renesas Technology Corp |
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46 / 138 page  M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP Rev.1.00 Nov 01, 2002 page 46 of 136 REJ03B0129-0100Z 8.8 A-D COMPARATOR The A-D comparator consists of a 7-bit D-A converter and a com- parator. The A-D comparator block diagram is shown in Figure 8.8.1. The reference voltage “Vref” for D-A conversion is set by bits 0 to 6 of A-D control register 2 (address 00ED16). The comparison result of the analog input voltage and the reference voltage “Vref” is stored in bit 4 of A-D control register 1 (address 00EC16). For A-D comparison, set “0” to corresponding bits of the direction register to use ports as analog input pins. Write the data to select analog input pins for bits 0 to 2 of A-D control register 1 and write the digital value corresponding to Vref to be compared to bits 0 to 4 of A-D control register 2. The voltage comparison is started by writing to A-D control register 2, and it is completed after 16 machine cycles (NOP instruction ✕ 8). Fig. 8.8.1 A-D Comparator Block Diagram A-D control register 1 Bits 0 to 2 Comparator control Data bus Bit 4 Switch tree A-D control register 2 Resistor ladder Compa- rator Analog signal switch Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 A-D control register 1 AD1 AD2 AD3 AD4 AD5 AD6 AD7 AD8 |
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