HD6432138SW datasheet(733/1061 Pages) RENESAS

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HD6432138SW Datasheet(PDF) 733 Page - Renesas Technology Corp

Part #	HD6432138SW

Description	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1061 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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733 / 1061 page

Section 23 Clock Pulse Generator

Rev. 4.00 Jun 06, 2006 page 679 of 1004

REJ09B0301-0400

23.9

Clock Selection Circuit

This circuit selects the system clock used in the MCU.

The clock signal generated in the EXTAL/XTAL pin oscillator is selected as the system clock

when MCU is returned from high-speed mode, medium-speed mode, sleep mode, reset state, or

standby mode.

In sub-active mode, sub-sleep mode, and watch mode, the sub-clock signal input from EXCL pin

is selected as the system clock. In these modes, modules such as CPU, TMR0, TMR1, WDT0,

WDT1, and I/O ports operate on the

φ SUB clock. The count clock for each timer is a clock

obtained by dividing the

φ SUB clock.

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