TL Electronic EL1083, User Manual

Page: 143 / 146

Appendix B Technical Summary
Page: B-14
Code example for watch dog timer
Enable watchdog timer and set timeout interval to 30 seconds.
;------ Enter to extended function mode --------------------------------------------------------
mov dx, 2eh
mov al, 87h
out dx, al
out dx, al
;------ Select Logical Device 8 of watchdog timer --------------------------------------------
mov al, 07h
out dx, al
inc dx
mov al, 08h
out dx, al
;------ Set second as counting unit --------------------------------------------------------------
dec dx
mov al, 0f5h
out dx, al
inc dx
in al, dx
and al, not
08h
out dx, al
;------ Set timeout interval as 30seconds and start counting ---------------------------------
dec dx
mov al, 0f6h
out dx, al
inc dx
mov al,
30
out dx, al
;------ Exit the extended function mode --------------------------------------------------------
dec dx
mov al,
0aah
out dx, al