User`s guide

10 • Installation

JP1

2.6 Watchdog Timer setting

JP8, JP10/ JP11

The Watch-Dog Timer is enabled by reading port 443H.The Watch-Dog

Timer should be triggered before the Watch-Dog Timer time-out period

ends, otherwise the Watch-Dog Timer assumes the program operation is

abnormal and will issue a reset signal to start again, or activate NMI (by

Pull-Low IOCHK#) to the CPU. The Watch-Dog Timer is disabled by reading

port 043H.

The Watch-Dog Timer time-out period can be set 10sec, 15sec, 25sec and

80sec.

Watchdog Timer setting

WT DOG

JP8

NMI 1-2

1 2 3

Reset 2-3

1 2 3

Default

Disabled

OPEN

1 2 3

WDT Time-Out Period setting: JP10, JP11

WDT Period

JP10 JP11

80sec. OPEN

OPEN

25sec. OPEN

SHORT

15sec. SHORT

OPEN

10sec. SHORT

SHORT

(default)