UPD78F0949 datasheet(23/72 Pages) RENESAS

Part #	UPD78F0949

Description	PRELIMINARY PRODUCT INFORMATION

PDF	72 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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µPD78F0949

6.2 Clock Generator

There are two kinds of clock generators: main system and subsystem clock generators.

It is possible to change the instruction execution time.

• 0.25 µs/0.5 µs/1 µs/2 µs/4 µs (at main system clock frequency of 8.0 MHz)

• 122 µs (at subsystem clock frequency of 32.768 kHz)

6.3 Main system clock oscillator

The main system clock oscillator oscillates with a crystal or a ceramic resonator connected to the

X1 and X2 pins.

Figure 6-2: Oscillator Circuit

Figure 6-1: Clock Generator Block Diagram

(a) Crystal and ceramic oscillation

(b) External clock

f X

f XT

CPU Clock (fCPU)

Prescaler

Standby

Control

Circuit

Prescaler

Clock to peripheral

hardware

Watch Timer

Main System

Clock

Oscillator

Subsystem

Clock

Oscillator

f X

f XT

STOP

CL1

CL2

Crystal

resonator

or ceramic

resonator

External

Clock

UPD78F0949 Datasheet(PDF) 23 Page - Renesas Technology Corp

UPD78F0949 Datasheet(HTML) 23 Page - Renesas Technology Corp

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