Table A.1: Watchdog Timer Registers

Address of register (2E)

Attribute

 

 

 

Read/Write

Value (2F) and description

 

 

 

87 (hex)

-

Write this address to I/O address port 2E

 

 

(hex) twice to unlock the W83627UHG

07 (hex)

write

Write 08 (hex) to select register of

 

 

watchdog timer.

30 (hex)

write

Write 01 (hex) to enable the function of

 

 

the watchdog timer. Disabled is set as

 

 

default.

F5 (hex)

write

Set seconds or minutes as units for the

 

 

timer.

Write 0 to bit 3: set second as counting unit. [default]

Write 1 to bit 3: set minute as counting unit.

F6 (hex)

write

0: stop timer [default]

 

 

01~FF (hex): The amount of the count,

 

 

in seconds or minutes, depends on the

 

 

value set in register F5 (hex). This num-

 

 

ber decides how long the watchdog

 

 

timer waits for strobe before generating

 

 

an interrupt or reset signal. Writing a

 

 

new value to this register can reset the

 

 

timer to count with the new value.

F7 (hex)

read/write

Bit 6: Write 1 to enable keyboard to reset

 

 

the timer, 0 to disable.[default]

 

 

Bit 5: Write 1 to generate a timeout sig-

 

 

nal immediately and automatically

 

 

return to 0. [default=0]

 

 

Bit 4: Read status of watchdog timer, 1

 

 

means timer is ""time out""."

AA (hex)

-

Write this address to I/O port 2E (hex)

 

 

to lock the watchdog timer.2.

AIMB-258 User Manual

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Arkon AIMB-258 user manual Table A.1 Watchdog Timer Registers