Table B.1: Watchdog Timer Registers

Address of

Attribute

Description

register (2E)

 

 

 

 

 

Read/Write

Value (2F)

 

 

and

 

 

description

 

 

 

 

87 (hex)

-----

Write this address to I/O address

 

 

port 2E (hex) twice to unlock the

 

 

W83627HF

 

 

 

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 number

 

 

decides how long the watchdog

 

 

timer waits for strobe before gener-

 

 

ating an interrupt or reset signal.

 

 

Writing a new value to this register

 

 

can reset the timer to count with the

 

 

new value.

 

 

 

F7 (hex)

rd/wr

Bit 6: Write 1 to enable keyboard to

 

 

reset the timer, 0 to disable.[default]

 

 

Bit 5: Write 1 to generate a timeout

 

 

signal immediately and automati-

 

 

cally 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

 

 

 

TPC-1261H User Manual

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B&B Electronics TPC-1261H user manual Table B.1 Watchdog Timer Registers