H8SSLASH2218 datasheet(654/750 Pages) RENESAS

Il numero della parte	H8S/2218

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

PDF	750 Pages

Scroll/Zoom	100%

Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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654 / 750 page

Section 19 Clock Pulse Generator

Rev.6.00 Jun. 03, 2008 Page 606 of 698

REJ09B0074-0600

This LSI

Ouptut port

External

interrupt

EXTAL

Request switchover of external clock

Interrupted external signal

External clock switchover signal

External clock 1

External clock 2

Control

cycle

Figure 19.11 Example of External Clock Switching Circuit

200 ns or more

(2)

(1)

(2)

(3)

(4)

(5)

Port setting (clock switchover)

Software standby mode transition

External clock switchover

External interrupt generation

(Input interrupt at least 200 ns after transition to software standby mode.)

Interrupt exception handling

(5)

SLEEP instruction

execution

Interrupt exception handling

Operation

External

clock 1

External

clock 2

(1)

Port setting

(3)

External clock

switchover

signal

EXTAL

Internal

clock

(4)

Wait time

External

interrupt

Active (external clock 2)

Software standby mode

Active (external clock 1)

Clock switchover

request

Figure 19.12 Example of External Clock Switchover Timing

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