DMC73C167 datasheet(45/90 Pages) DAEWOO

45 / 90 page

8Bit Single Chip Microcontroller

DMC73C167

5.5.3 Warming-up Timer

A 14-bit counter (P33, P34) is used as a warming-up delay timer which supplies a stable

oscillation condition from the system halt mode. The system clock cannot be active before

the warming-up counter's underflow. Fosc/2 (system clock frequency) is the decrementer

clock source of the 14-bit warm-up counter. The delay time is programmable by changing

P33 (the 6-bit MS value) and P34 (the 8-bit LS value).

Caution :

Set P35 to 0 before executing the IDLE instruction to avoid the unreliable setting of the

warming-up timer value.

5.6 A/D Converter

The key features of the A/D converter are as follows.

Analog input

: 1 channel (A0)

Analog input range

: VCC to VSS

Conversion

: Successive approximation conversion

Resolution

: 4 bit

Conversion time

:40 machine cycle

Figure 5-8. A/D Converter Function Diagram

5.6.1 Reference Values of A/D Conversion

The reference values of ADDATA are listed below. VSS and VCC are assumed to be 0 and

+5V, respectively.

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Pin A0

Analog

Comparator

4-bit D/A

Converter

4-bit

Data Register

VSS

VCC

A/D START (P16.Bit7)

Enable Analog Input

(P16.Bit0)

General Input A0

ADDATA (P17)

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