UPD178004A datasheet(16/56 Pages) NEC

Part #	UPD178004A

Description	8-BIT SINGLE-CHIP MICROCONTROLLERS

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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16

µPD178004A, 178006A, 178016A, 178018A

5.2 CLOCK GENERATOR

The instruction execution time can be changed as follows.

0.44

µs/0.88 µs/1.78 µs/3.56 µs/7.11 µs/14.22 µs (@ 4.5-MHz crystal oscillator with system clock.)

Figure 5-1. Clock Generator Block Diagram

X1

X2

fXX

Prescaler

System

Clock

Oscillator

Clock to peripheral

hardware other than

the above.

Clock to the PLL

frequency synthesizer,

basic timer and buzzer

output control circuit.

CPU Clock

(fCPU)

Standby

Control

Circuit

Wait Control

Circuit

To INTP0

Sampling Clock

2

fXX

22

fXX

23

fXX

24

fXX

Prescaler

Selector

fX

2

STOP

Scaler

5.3 TIMER

The

µPD178004A, 178006A, 178016A, and 178018A incorporate 5 channels of the timer.

• Basic timer

: 1 channel

• 8-bit timer/event counter

: 2 channels

• 8-bit timer (D/A converter) Note

: 1 channel

• Watchdog timer

: 1 channel

Note

Used is shared with the 8/9-bit resolution

× 3-channel D/A converter (PWM output).

Figure 5-2. Basic Timer Block Diagram

Divider

4.5 MHz

INTTMC

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UPD178004A Datasheet(PDF) 16 Page - NEC

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