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D17133CS Datasheet(PDF) 146 Page - NEC |
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D17133CS Datasheet(HTML) 146 Page - NEC |
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146 / 289 page  CHAPTER 13 PERIPHERAL HARDWARE 131 13.2 COMPARATOR ( µPD17132, 17133, 17P132, AND 17P133 ONLY) The comparator of the µPD17132, 17133, 17P132, and 17P133 compares the analog input (Cin0 to Cin3) and reference voltage (external: 1 type, internal: 15 types) and stores the comparison result to CMPRSLT (RF: 1EH, bit 0). The comparator can also be used as a 4-bit A/D converter by software using 15 types of internal reference voltage. 13.2.1 Configuration of Comparator Figure 13-8. Configuration of Comparator Remark The sampling time of an analog input is as follows: µPD17132, 17P132: 8/fCC (4 µs, at 2 MHz) µPD17133, 17P133: 28/fX (3.5 µs, at 8 MHz) RF : 1CH CMPCH1 CMPCH1 0 0 RF : 1DH CMPVREF1 CMPVREF2 RF : 1EH CMPSTRT CMPRSLT 0 0 Control circuit POC0/Cin0 POC1/Cin1 POC2/Cin2 POC3/Cin3 Comparator CMPVREF0 CMPVREF3 Internal bus R R × 16 R POE1/Vref 100pF MAX. – + |
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