H8SSLASH2224 datasheet(864/1071 Pages) RENESAS

Il numero della parte	H8S/2224

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	1071 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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Section 23 Clock Pulse Generator

Rev. 5.00 Aug 08, 2006 page 778 of 982

REJ09B0054-0500

This LSI

Port output

External

interrupt

EXTAL

External clock 1

External clock 2

Control

circuit

External clock switch request

External interrupt signal

External clock switch signal

Figure 23.6 External Clock Switching Circuit (Example)

200 ns or more

(2)

(1) Port output (clock switching)

(2) Transition to software standby mode

(3) External clock switching

(4) External interrupt generation

(An interrupt should be input 200 ns or more after transition to software standby mode.)

(5) Interrupt exception handling

(5)

SLEEP instruction

execution

Interrupt exception handling

Operation

External

clock 1

External

clock 2

(1)

Port output

(3)

External

clock

switching

circuit

EXTAL

Internal

clock

(4)

standby time

External

interrupt

Active (External clock 1)

Active (External clock 2)

Software standby mode

Clock switching

request

Figure 23.7 External Clock Switching Timing (Example)

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