Specifications

8.4.1 Watchdog Status & Control Register (I/O address 214h)
765 43 2 1 0
|________|________|_________|________|_________|_________|_________|_________|
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RFU SYSTEM S/W ENABLE STATUS NMI PAT PAT
RESET ENABLE LINK RESET 1 2
ENABLE
Bits 1- 0: Watchdog Restart Bits (Read/Write)
Refer to the following description on watchdog configuration.
Bit 2: Select Watchdog Action (Read/Write)
This bit selects the following actions when the watchdog times out.
0 = Generate an NMI (default)
1 = Generate a board reset
Bit 3: Watchdog Status (Read Only)
0 = Watchdog timed out
1 = Watchdog OK
This bit can be used to determine if the watchdog was the source of an NMI or reset.
A valid watchdog restart will set this bit to ‘Watchdog OK’ if the watchdog had previously timed
out.
Bit 4: Watchdog Enable Jumper Status (Read Only)
0 = Watchdog is under software control
1 = Watchdog disabled in hardware
Bit 5: Watchdog Software Enable (Read/Write)
0 = Watchdog disabled (default)
1 = Watchdog enabled
Bit 6: Watchdog System Reset Enable (Read/Write)
0 = Local reset only (Default)
1 = Local and system reset
Watchdog action (Bit 2) must be set to ‘1’ for this bit to have any effect.
Bit 7: Reserved, Read as ‘0’
VP 110/01x 8-7
Additional Local I/O Functions