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Watchdog (79h)
I/O Address:
79h
Default Value: 0x00
Attribute:
R/W
Bit
Description
7
Stage 2 Monitor (Reset Monitor)
Monitors the second stage (Reset) timer status.
Read Value:
0 = Watchdog has not timed out since power up or since this bit was last set to 0.
1 = Watchdog reset timeout occurred since power up or since bit was last set to 0.
Write Value:
0 = Sets this bit to 0.
1 = No effect.
Power Up Value = 0.
A hard reset not caused by a watchdog timeout will set this bit to 0.
6
Stage 1 Monitor (NMI or INIT Monitor)
Monitors the first stage (NMI or INIT) timer status.
Read Value:
0 = Watchdog has not timed out since power up or since this bit was last set to 0;
1 = Watchdog timed out and either:
• NMI output was asserted if bit 3 = 0; or
• INIT output was asserted if bit 3 = 1.
Write Value:
0 = Sets this bit to 0.
1 = No effect.
Power Up Value = 0.
A hard reset will set this bit to 0.
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C. System Registers
71
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