Solid State Logic AR-B7041 manual Watchdog Timer Trigger, Watchdog Timer Disabled

AR-B7041 User¡¦s Guide

2.4.4 Watchdog Timer Trigger

After you enable the watchdog timer, your program must write the same factor as enabling to the watchdog register at least once every time-out period to its previous setting. You can change the time-out period by writing another timer factor to the watchdog register at any time, and you must trigger the watchdog before the new time-out period in next trigger. Below is a BASICA program which demonstrates how to trigger the watchdog timer:

2000	REM Points to command register
2010	WD_REG% = BASE_PORT% + 3
2020	REM Timer factor = 84H
2030	TIMER_FACTOR% = &H84
2040	REM Output factor to watchdog register
2050	OUT WD_REG%, TIMER_FACTOR%
	.,etc.

2.4.5 Watchdog Timer Disabled

To disable the watchdog timer, simply write a 00H to the watchdog register.

3000	REM Points to command register
3010	WD_REG% = BASE_PORT% + 3
3020	REM Timer factor = 0
3030	TIMER_FACTOR% = 0
3040	REM Output factor to watchdog register
3050	OUT WD_REG%, TIMER_FACTOR%
	., etc.

2-7