H838024 datasheet(322/697 Pages) RENESAS

Part #	H838024

Description	Renesas 8-Bit Single-Chip Microcomputer Super Low Power Series

PDF	697 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 9 Timers

Rev. 7.00 Mar 10, 2005 page 280 of 652

REJ09B0042-0700

Program process

Interrupt request flag

(IRRTFH, IRRTFL)

Interrupt factor

generation signal

(Internal signal,

nega-active)

Overflow signal,

Compare match signal

(Internal signal,

nega-active)

Interrupt

Normal

Interrupt request

flag clear

Interrupt request

flag clear

(1)

(2)

Figure 9.7 Clear Interrupt Request Flag when Interrupt Factor Generation Signal is Valid

Timer Counter (TCF) Read/Write

When

φw/4 is selected as the internal clock in active (high-speed, medium-speed) mode, write on

TCF is impossible. And, when read TCF, as the system clock and internal clock are mutually

asynchronous, TCF synchronizes with synchronization circuit. This results in a maximum TCF

read value error of

±1.

When read/write TCF in active (high-speed, medium-speed) mode is needed, please select internal

clock except for

φw/4 before read/write.

In subactive mode, even

φw/4 is selected as the internal clock, normal read/write TCF is possible.

H838024 Datasheet(PDF) 322 Page - Renesas Technology Corp