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PCM-5894 User's Manual
Programming the watchdog timer
An on-board watchdog timer reduces the chance of disruptions
which EMP (electro-magnetic pulse) interference can cause.
This is an invaluable protective device for standalone or un-
manned applications. When the watchdog timer activates(CPU
processing has come to a halt), it can reset the system, or
generate an interrupt on IRQ10, IRQ11, IRQ15, NMI. This can be
set via I/O Port 444, the functions as following:
0 :
RESET
1 :
IRQ10
2 :
IRQ15
3 :
IRQ11
4 :
NMI
If you decide to program the watchdog timer, you must write data
to I/O port 443 (hex). The output data is a value timer. You can
write from 80 (hex) to FF (hex) for input minute data plus from
00 (hex) to 7F (hex) for input second data, and the related timer is
2 second to 127 minutes plus 127 seconds sec.
After data entry, your program must refresh the watchdog timer
by rewriting the I/O port 443 (hex) while simultaneously setting
it. When you want to disable the watchdog timer, your program
should write I/O port 80 (hex) a Hex value.
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