Kontron PCI-946-1 Technical Reference Manual page 62

PCI-946-1 and P3S440BX Technical Reference manual
A variable refresh is possible as shown below:
8.6 ms
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n96 h
The programmable watchdog can be viewed as a decrementing counter that is
initialized by a write to register n96h (n = 1, 2 or 3). The processor must initialize
the counter to prevent it from reaching count 0 (timeout).
The following C language procedure can be used to trigger the programmable
watchdog.
#define TekReg 0x190
void TrigWatchdog(timeout) // select timeout at runtime: 0x80 = 0.016s,
// 0x90 = 0.065s, 0xA0 = 0.261s, ...
{
outp(TekReg+6,(inp(TekReg+6) & 0x0F) | (timeout & 0xF0));
}
Watchdog internal counter value
// define base address (0x190, 0x290 or 0x390)
3-18
8.6 ms