Instruction manual

30 SBC-400 User's Manual
IRQ11 IRQ12
IRQ12 IRQ11
Watchdog timer setup
Watchdog timer time-out
signal select (JP38)
If CPU processing comes to a halt because of EMI or software bug,
the watchdog timer can either reset the CPU or signal an interrupt
on IRQ15.
Watchdog timer time-out signal select (JP38)
Reset CPU IRQ15
Watchdog timer programming
The watchdog timer must be programmed to write to I/O port
address 443 at an interval shorter than the timer's preset interval.
The timer's interval has a tolerance of ±5%, so you should program
an instruction that will refresh the timer before a time-out occurs.
1 2 3
1 2 3