C. System Registers
73
Watchdog (79h), continued
Bit Description
3
NMI or INIT
Selects between generating an NMI or a CPU INIT.
Read Value:
0 = NMI
1 = INIT
This bit is set to 0 at reset.
Write Value:
0 = NMI is generated when the watchdog times out.
1 = INIT is generated when the watchdog times out.
Power Up Value = 0.
A hard reset will set this bit to 0.
2:0
Terminal Count (TermCnt2…TermCnt0)
Read Value: Reflects the value written to bits 2 through 0.
Write Value: These bits determine the terminal count of the watchdog.
Below is the minimum timeout period. The watchdog times out in no less than the
minimum value. The nominal timeout period is 30% longer than the minimum.
000 = 250 ms
100 = 32 s
001 = 500 ms
101 = 64 s
010 = 1 s
110 = 128 s
011 = 8 s
111 = 256 s
Power Up Value = 000.
A hard reset will set these bits to 000.
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