UPD17145CT datasheet(45/102 Pages) NEC

45 / 102 page

µPD17145(A1), 17147(A1), 17149(A1)

14. A/D CONVERTER

The

µPD17149(A1) is provided with an A/D converter with 4 analog input channels (P0C0/ADC0-P0C3/ADC3)

and a resolution of 8 bits.

This A/D converter is of the successive approximation type and operates in the following two modes:

Successive mode in which 8-bit A/D conversion is sequentially performed starting from the most

significant bit

Single mode in which an input analog voltage is compared with the set value of an 8-bit data register

14.1 Configuration of A/D Converter

Figure 14-1 shows the configuration of the A/D converter.

Figure 14-1. Block Diagram of A/D Converter

Note

The 8-bit data register (ADCR) is cleared to 00H when the STOP instruction is executed.

Internal bus

Read signal

P0Cn/ADCn

RF: 22H

RF: 20H

RF: 21H

0 0 ADCCH1 ADCCH0

0 0 0 ADCSTRT

ADCSOFT

0 ADCCMP ADCEND

Control circuit

Comparator

Selector

Tap decoder

8-bit data register Note

(ADCR)

D/A converter

R/2

3R/2

Remark n = 0 to 3

Output

latch

Selector

P0CnIDI

P0CBIOn

P0F1 input data

A/D end signal

STOP instruction signal

P0F1/VREF

P0CnIDI

UPD17145CT Datasheet(PDF) 45 Page - NEC

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