Register Summary
60
– Register Descriptions
VL-586-1 Reference Manual
W
ATCHDOG
T
IMER
H
OLD
-O
FF
R
EGISTER
WDHOLD (WRITE ONLY) 00E1H
D7
D6
D5
D4
D3
D2
D1
D0
0
1
0
1
1
0
1
0
A watchdog timer circuit is included on the CPU card to reset the CPU if proper software
execution fails or a hardware malfunction occurs. The watchdog timer is enabled/disabled by
writing to bit D0 of SCR
If the watchdog timer is enabled, software must periodically refresh the watchdog timer at a rate
faster than the timer is set to expire (250 ms). Writing a 5Ah to WDHOLD resets the watchdog
time-out period, preventing the CPU from being reset for the next 250 ms.
Содержание VL-586-1
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