Aaeon BOXER-6914, Manual

Page: 54 / 89

E m b e d d e d B o x P C B O X E R - 6 9 1 4
A.1 Watchdog Timer Initial Program
ND_PROCESS MACRO
mov ah, 4ch
int 21h
ENDM
;******************* Code Segment ******************
.MODEL SMALL
.CODE
begin:
; Set BRAM_Device as 0xA0
mov dx, 284h
mov al, 10h
out dx, al
inc dx
mov al, 0A8h
out dx, al
;Set BRAM_Command as 0x00 (GPIO device input/output
;access)
dec dx
mov al, 11h
out dx, al
inc dx
mov al, 00h
out dx, al
; Set BRAM_Data2 as 0xFF (WDT Counter)
dec dx
mov al, 15h
out dx, al
inc dx
mov al, 3Ch ;60 Sec
Appendix A Programming the Watchdog Timer
A-2