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HD404458 Datasheet(PDF) 97 Page - Renesas Technology Corp |
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HD404458 Datasheet(HTML) 97 Page - Renesas Technology Corp |
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97 / 122 page  HD404459 Series 95 Comparator The comparator (figure 78) compares an analog input voltage with a reference voltage. Either a 16-level internal or external reference power supply can be selected. The voltage comparison is started by writing 1 to the comparator start flag (CMSF: $020, bit 2), and is completed after 4t cyc. The comparison result is stored into bit 3 (CER: $017, bit 3) of the comparator enable register, and can be read by the bit test instruction (TM or TMD). The comparison result must be read after confirming that the comparator start flag (CMSF: $020, bit 2) is at 0 (figure 79). COMP Comparator control register (CCR) Comparator start flag (CMSF) Comparator enable register (CER) Internal data bus R93/VCref RA0/COMP0 RA1/COMP1 RA2/COMP2 RA3/COMP3 4 4 1 1 1 1 3 2 Figure 78 Block Diagram of Comparator |
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