UPD17062 Datasheet, PDF (233/296 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER CONTAINING PLL FREQUENCY SYNTHESIZER AND IMAGE DISPLAY CONTROLLER

µPD17062
19. A/D CONVERTER
The µPD17062 contains a 4-bit program-controlled A/D converter that operates with a successive compari-
son method.
19.1 PRINCIPLE OF OPERATION
The A/D converter in the µPD17062 consists of a 4-bit resistor string-based D/A converter and comparator.
The D/A converter is set with data using a 4-bit register (ADCR) mapped at peripheral address 02H. The
result of comparison is judged according to the ADCCMP flag in the register file.
Fig. 19-1 A/D Converter Configuration
ADCCH (R/W) ADCCMP (R)
ADCCH ADCCH ADCCH AD
2
1
0 CCMP
RF : 21H
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
Channel
selector
D/A converter
Comparator
ADCR
Peripheral address: 02H
ADCR (R/W)
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