Advantech TPC-1270 Manual do Utilizador descarregar pdf (Página 58)

TPC-1270 User Manual 48

Table B.1: Watchdog Timer Registers

Address of

Attribute Description

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

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 85 86

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Advantech TPC-1270 Manual do Utilizador Página 58