M16CSLASH26 datasheet(34/239 Pages) RENESAS

tên linh kiện	M16C/26

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Clock Generating Circuit

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Clock Generating Circuit

The clock generating circuit contains three oscillator circuits as follows:

(1) Main clock generating circuit

(2) Sub clock generating circuit

(3) Ring oscillator

Table 1.8.1 lists the clock generating circuit specifications.

Table 1.8.1. Clock generating circuits

Example of oscillator circuit

- CPU's operating

clock source

- Internal peripheral

unit's operating

Use of clock

Main clock

generating circuit

Sub clock

generating circuit

Item

- CPU's operating

clock source

- Timer A/B's count

clock source

- Ceramic oscillator

- Crystal oscillator

Usable oscillator

- Crystal oscillator

XIN, XOUT

Pins to connect

oscillator

XCIN, XCOUT

Available

Oscillation stop/

restart function

Available

Oscillating

Oscillator status

after reset

Stopped

Externally derived clock can be input

Other

Ring oscillator

- CPU and peripheral

function clock source

when main clock

frequency stops

Available

Stopped

About 1MHz

CPU clock source

Peripheral function

clock source

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