Peak 550/PISA 550 User’s Guide
Watch Dog Timer A-1
Appendix
Watch Dog Timer
Set up menu: refer to Page 4-24, “Integrated Peripherals”
WDT Configuration port
F2
Default at F2
Watch Dog Timer
Disabled
1. Default at disabled
Enabled
2. Enabled for user
′
s programming
WDT Time out active for
Reset
Default at Reset
NMI
WDT Active Time
1 sec
2 sec
4 sec
8 sec
16 sec
32 sec
64 sec
Default at 64sec
You can program “INDEX 7D” in the CMOS RAM to read or change the set up
information.
Example
•
Read index 7D in the CMOS RAM
MOV
DX, 70
MOV
AL, 7D
OUT
DX, AL
MOV
DX, 71
IN
AL, DX
•
Write to index 7D in the CMOS RAM
MOV
DX, 70
MOV
AL, 7D
OUT
DX, AL
MOV
DX, 71
MOV
AL, Data
OUT
DX, AL
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