AXIOMTEK SBC81821, User Manual

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SBC81821 Socket478 All-in-One CPU Card Series User’s Manual
Watchdog Timer
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Start
↓↓↓↓
Un-Lock WDT : OUT 120H 0AH ; enter WDT function
OUT 120H 0BH ; enable WDT function
↓↓↓↓
Set multiple (1~4) : OUT 120 0NH ; N=1,2,3 or 4
↓↓↓↓
Set base timer (0~F) : OUT 121 0MH ; M=0,1,2,…F
↓↓↓↓
WDT counting
↓↓↓↓
re-set timer : OUT 121 0MH ; M=0,1,2,…F
↓↓↓↓
IF No re-set timer : WDT time-out, generate RESET or NMI
↓↓↓↓
IF to disable WDT : OUT 120 00H ; Can be disable at any time