Using The Watchdog Function - AXIOMTEK SHB212 Series User Manual

SHB212 PICMG1.3 Half-Size SBC User's Manual

Using the Watchdog Function

 Assembler Sample Code
;Enable WDT：
Mov dx , 2Eh
Mov al , 87h
Out dx , al
Out dx , al
;Select Logic device：
Mov dx , 2Eh
Mov al , 07h
Out dx , al
Mov dx , 2Fh
Mov al , 08h
Out dx , al
;Set WDT Function：
Mov dx , 2Eh
Mov al , 2Dh
Out dx , al
Mov dx , 2Fh
Mov al , 20h
Out dx , al
;Activate WDT：
Mov dx , 2Eh
Mov al , 30h
Out dx , al
Mov dx , 2Fh
Mov al , 01h
Out dx , al
;Set Second or Minute：
Mov dx , 2Eh
Mov al , F5h
Out dx , al
Mov dx , 2Fh
Mov al , Nh ;N=00 or 08(See below
Out dx al
66
)
WATCHDOG TIMER