7733 datasheet(449/940 Pages) RENESAS

tên linh kiện	7733

Giải thích chi tiết về linh kiện	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	940 Pages

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nhà sản xuất	RENESAS [Renesas Technology Corp]

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APPLICA

TIONS

7733 Group User’s Manual

17–42

(3) Approximate flowchart

17.3 Watchdog timer

Fig. 17.3.2 Approximate flowchart

Watchdog timer register

8-bit dummy data

(address 6016)

Main routine

Watchdog timer is initialized.

Watchdog timer’s value: FFF 16

(Note 1)

Watchdog timer interrupt routine

Software reset bit

“1 ”

(bit 3 at address 5E 16)

RTI

Watchdog timer interrupt

request occurs.

(Detection of a

program runaway)

(Note 2)

Microcomputer is resset.

Notes 1: The watchdog timer is initialized again from when the watchdog timer is initialized until the most

significant bit of the watchdog timer becomes “0,” in other words, until a watchdog timer interrupt

request occurs.

2: When a program runaway occurs, there is a possibility that values of data bank register (DT),

direct page register (DPR), and others are incorrect. When accessing the software reset bit by using

an addressing mode which uses DT, DPR, and others, be sure to set values of DT, DPR, and others again.

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