Rainbow Electronics AT75C310 - Manual (Page 121)

AT75C310
121
WD Enabling Sequence
To enable the watchdog timer the sequence is as follows:
1. Disable the watchdog by clearing the bit WDEN:
Write 0x2340 to WD_OMR
This step is unnecessary if the WD is already disabled
(reset state).
2. Initialize the WD Clock Mode Register:
Write 0x373C to WD_CMR
(HPCV = 15 and WDCLKS = MCK/8)
3. Restart the timer:
Write 0xC071 to WD_CR
4. Enable the watchdog:
Write 0x2345 to WD_OMR (interrupt enabled)