7480 datasheet(187/337 Pages) RENESAS

Il numero della parte	7480

Spiegazioni elettronici	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	337 Pages

Scroll/Zoom	100%

Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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187 / 337 page

7480 Group and 7481 Group User's Manual

1-170

1.19 Power Saving Function

HARDWARE

1.19.5 Notes on Usage

Pay attention to the following notes when the power saving function is used.

(1)

Setting of Valid/Invalid of STP and WIT Instructions

To make the STP and the WIT instruction valid, write twice successively to the STP instruction

operation control register while interrupts are disabled.

REASON: Execution of an interrupt service routine may cause this register not to be successively

written.

(2)

In Stop Mode

After the CPU is brought out of the stop mode, timer 1 operates in the following conditions. Re-set

timer 1 if necessary.

• Contents of the timer 1 latch: ‘FF16’

• Count source: f(XIN)/8

Since the A-D converter stops in the stop mode, execute the STP instruction after A-D conversion

is completed.

In the stop mode, timer X and timer Y continue counting only in the event count mode.

Serial I/O operates only when an external clock (or its 1/16) is selected as the synchronous clock

in the stop mode.

7480 Scheda tecnica(PDF) 187 Page - Renesas Technology Corp