AR-B9673 User’s Guide
15
3.18 PC104 CONNECTOR (PC-104)
•
64Pin PC104 Connector A&B
63
64
1
2
•
40Pin PC104 Connector C&D
39
40
1
2
3.19 COMPACT FLASH CONNECTOR (CF2,J5)
4. WATCHDOG TIMER
This section describes the use of Watchdog Timer, including enable, and trigger. AR-B9673 is equipped with a
programmable time-out period watchdog timer that occupies I/O port
3F0/3F1
. Users can use simple program to
enable the watchdog timer. Once you enable the watchdog timer, the program should trigger it every time before it
times out. Watchdog Timer will generate a response (system or IRQ15) due to system fails to trigger watchdog timer
before preset timer, times out.
System reset and IRQ15 reset signal command as follows:
- o 3F0 72 ; Used system reset signal
- o 3F1 00
- o 3F0 72 ; Used IRQ15 signal
- o 3F1 0F
- o 3F0 F2 ; Set timer for xx second (xx=0 ~ 255)
- o 3F1 xx
