Nexcom Peak 555A User Manual page 89

Peak 555A User's Guide
An Example
a. Enable watchdog timer
b. Select I/O port F2 & set WDT timer at 1 sec interval
c. Select NMI
d. Enable WDT
e. Clear WDT
f. Disable WDT
a. Set RTC to generate WDT timer source "SQW" to generate 0.5 sec.
duty cycle timer source
MOV AL, 0A
MOV DX, 070
OUT DX, AL
MOV AL, 2F
MOV DX, 071
OUT DX, AL
MOV AL, 0B
MOV DX, 070
OUT DX, AL
MOV AL, 0A
MOV DX, 071
OUT DX, AL
Watch Dog Timer
; Set RTC output signal "SQW" to generate 0.5 sec.
cycling timer
; Enable "SQW" signal pin active
A-4