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Chapter 1 Hardware Configuration
13
1.8.3 Watchdog timer output (J2)
The PCA-6275 contains a watchdog timer that will reset the
CPU or send a signal to IRQ11 in the event the CPU stops
processing. This feature means the PCA-6275 will recover
from a software failure or an EMI problem. The J2 jumper
settings control the outcome of what the computer will do
in the event the watchdog timer is tripped.
Table 1-4: Watchdog timer output (J2)
Function Jumper setting
IRQ11 1-2 closed
Reset 2-3 closed
1.8.4 CMOS clear (J4)
The PCA-6275 CPU card contains a jumper that can erase
CMOS data and reset the system BIOS information. Normal-
ly this jumper should be set with pins 1-2 closed. If you
want to reset the CMOS data, set J4 to 2-3 closed for just a
few seconds, and then move the jumper back to 1-2 closed.
This procedure will reset the CMOS to its default setting.
Table 1-5: CMOS clear (J4)
Function Jumper setting
Keep CMOS data 1-2 closed
Clear CMOS data 2-3 closed
1
1
1
1