SH7708 datasheet(336/633 Pages) RENESAS

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SH7708 データシート(PDF) 336 Page - Renesas Technology Corp

部品番号	SH7708

部品情報	SuperH??RISC engine

PDF	633 Pages

Scroll/Zoom	100%

メーカー	RENESAS [Renesas Technology Corp]

ホームページ	http://www.renesas.com

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336 / 633 page

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11.5

Usage Notes

11.5.1

Writing to Registers

Synchronization processing is not performed for timer counting during register writes. When

writing to registers, always clear the appropriate start bits for the channel (STR2–STR0) in the

timer start register (TSTR) to halt timer counting.

11.5.2

Reading Registers

Synchronization processing is performed for timer counting during register reads. When timer

counting and register read processing are performed simultaneously, the register value before

TCNT counting down (with synchronization processing) is read.

11.5.3

Clearing UNF in the TCR Register

When the RTC (realtime clock) is specified for use as the TMU (timer) clock source in the

SH7708 and SH7708S the procedure shown in the flowchart below should be used to clear the

underflow flag (UNF) in the timer control register (TCR).

Yes

Clear UNF flag

Read UNF flag

UNF = 0?

Figure 11.10 UNF Flag Clearing

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