H8SSLASH2214 datasheet(497/936 Pages) RENESAS

Il numero della parte	H8S/2214

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

PDF	936 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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Section 11 Watchdog Timer (WDT)

Rev.4.00 Sep. 18, 2008 Page 437 of 872

REJ09B0189-0400

Section 11 Watchdog Timer (WDT)

11.1

Overview

The H8S/2214 Group has an on-chip watchdog timer/watch timer with one channel. The watchdog

timer can generate an internal interrupt or an internal reset signal if a system crash prevents the

CPU from writing to the counter, allowing it to overflow.

When this watchdog function is not needed, the WDT can be used as an interval timer. In interval

timer mode, an interval timer interrupt is generated each time the counter overflows.

11.1.1

Features

WDT features are listed below.

• Switchable between watchdog timer mode and interval timer mode

• Internal reset or internal interrupt generated when watchdog timer mode

Choice of whether or not an internal reset (power-on reset or manual reset selectable) is

effected when the counter overflows

• Interrupt generation in interval timer mode

⎯ An interval timer interrupt is generated when the counter overflows

• Choice of 8 counter input clocks

⎯ Maximum WDT interval: system clock period × 131072 × 256

H8S/2214 Scheda tecnica(PDF) 497 Page - Renesas Technology Corp