al,0aah ;; Specific value to exit Config ;; Mode
dx,cs:CONFIG_PORT dx,al
dx ax
Appendix A Programming the Watchdog Timer
;;Enter to I/O Chip Program Configuration Register Mode Enterv Config proc
push | ax |
|
push | dx |
|
mov | al,87h | ;; Specific value to enter Config |
|
| ;; Mode |
mov | dx,cs:CONFIG_PORT | |
out | dx,al | ;; Write to Config Port twice! |
out | dx,al |
|
jmp | $+2 | ;; Delay |
jmp | $+2 | ;; |
pop | dx |
|
pop | ax |
|
ret |
|
|
EnterConfig endp
;;Exit to I/O Chip Program Configuration Register Mode ExitConfig proc
push ax push dx
mov
mov out pop pop ret
