HS-3000 datasheet(17/46 Pages) BOSER

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JP9: Watchdog Timer Active Type Select

JP9

Description

Short 1-2 (default)

System Reset

Short 2-3

Active NMI

Open

Disabled

JP14: Watchdog Timer Out Period Select

Period PINS 1-2 PINS 3-4 PINS 5-6 PINS 7-8

1 sec

(default)

Open

Short

Open

2 sec

Open

Short

10 sec

Open

Short

Open

20 sec

Open

Short

Open

Short

110 sec

Short

Open

220 sec

Short

Open

Short

The watchdog timer is disabled after the system power-on. The

watchdog timer can be enabled by a Enable cycle with reading the

control port (443H), a Refresh cycle with reading the control port

(443H) and a Disable cycle by reading the watchdog timer disable

control port (043H). After a Enable cycle of WDT, user must constantly

proceed a Refresh cycle to WDT before its period setting comes ending

of every 1, 2, 10, 20, 110 or 220 seconds (Please reference to the

selection table of JP14 for WDT Time Out period setting). If the Refresh

cycle does not active before WDT period cycle, the onboard WDT

architecture will issue a Reset or NMI cycle to the system. The

watchdog timer controlled by two I/O ports.

443H

I/O Read

Enable/Refresh cycle

043H

I/O Read

Disable cycle

The following sample program shows how to Enable, Disable and

Refresh the watchdog timer：

WDT_EN_RF

EQU

0433H

WDT_DIS

EQU

0043H

WT_Enable

PUSH

; keep AX DX

PUSH

MOV

DX,WDT_EN_RF

; enable the WDT

AL,DX

POP

; get back AX, DX

POP

RET

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