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7906 Datasheet(PDF) 299 Page - Renesas Technology Corp |
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7906 Datasheet(HTML) 299 Page - Renesas Technology Corp |
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299 / 531 page  A-D CONVERTER 7906 Group User’s Manual Rev.2.0 12-4 12.2 Block description 12.2 Block description Figure 12.2.1 shows the block diagram of the A-D converter. Registers relevant to the A-D converter are described below. Fig. 12.2.1 Block diagram of A-D converter φAD A-D conversion frequency ( φAD) select bits 1, 0 (1,1) Selection of A-D conversion frequency f2 (1,0) (0,1) (0,0) 1/2 1/2 f1 Comparator AVSS Resistor ladder network Selector AN0 AN1 AN2 AN3 AN4 Decoder Data bus (odd) VREF Vref Comparator function select register 0 Selector Selector Comparator result register 0 Control circuit Successive approximation register A-D register 0 A-D register 1 A-D register 2 A-D register 3 A-D register 4 1 A-D control register 1 A-D control register 0 0 1 VREF connection select bit Data bus (even) |
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