7733 datasheet(448/940 Pages) RENESAS

Nome de Peças	7733

Descrição Electrónicos	16-BIT SINGLE-CHIP MICROCOMPUTER

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Fabricante Electrônico	RENESAS [Renesas Technology Corp]

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APPLICATIONS

7733 Group User’s Manual

17–41

17.3 Watchdog timer

A program runaway detection example with using the watchdog timer is described below.

17.3.1 Program runaway detection example

In this example, when the watchdog timer detect a program runaway, the microcomputer is reset.

(1) Specifications

The main clock is the system clock and f(XIN) = 16 MHz.

When an interval of 4.09 ms has passed after value “FFF16” is set, the watchdog timer issues

an interrupt request. (When writing to address 6016 is not performed because of a program runa-

way.)

When a watchdog timer interrupt request occurs, the microcomputer is reset. (“Software reset” is

applied.)

(2) Initial setting for related register

17.3 Watchdog timer

Fig. 17.3.1 Initial setting for related register

Watchdog timer count source: clock f 32

(In the case where f(XIN) = 16 MHz, a watchdog timer interrupt request occurs

when an interval of 4.09 ms has passed after value “FFF 16” is set.)

@ Watchdog timer frequency selection flag (address 61 16)

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