TL Electronic EmbeddedLine EL1092-H, User Manual

Page: 148 / 151

Appendix B Technical Summary
Page: B-23
Code example for watch dog timer
; ------------------------- Enter to extended function mode -------------------------------
mov dx, 2eh
mov al, 87h
out dx, al
out dx, al
; ----------------------- Select Logical Device 7 of watchdog timer ---------------------
mov al, 07h
out dx, al
inc dx
mov al, 07h
out dx, al
;---------------------------------Enable Watch dog feature ------------------------------
mov al, 030h
out dx, al
inc dx
mov al, 01h
out dx, al
;------------------------------- Enable Watch PME--------------------------------------------
dec dx
mov al, 0FAh
out dx, al
inc dx
in al, dx
and al, 51h
out dx, al
;-------------------------- Set second as counting unit --------------------------------------
dec dx
mov al, 0f5h
out dx, al
inc dx
in al, dx
and al, 30h
out dx, al
; ---------------- Set timeout interval as 30seconds and start counting --------------
dec dx
mov al, 0f6h
out dx, al
inc dx
mov al, 1Eh
out dx, al
;---------------------------------Exit the extended function mode -------------------------
dec dx
mov al, 0aah
out dx, al