PCA-6742 User Manual
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B.1
Introduction
The PCA-6742’s watchdog timer can be used to monitor system software operation
and take corrective action if the software fails to function within the programmed
period. This section describes the operation of the watchdog timer and how to pro-
gram it.
B.1.1
Watchdog timer overview
The watchdog timer is built in to the W83627HG super I/O controller. It provides the
following user programmable functions:
!
Can be enabled and disabled by user’s program
!
Timer can be set from 1 to 255 seconds or 1 to 255 minutes
!
Generates an interrupt or reset signal if the software fails to reset the timer
before time-out
B.1.2 Programming the Watchdog Timer
The I/O port address of the watchdog timer is 2E (hex) and 2F (hex). 2E (hex) is the
address port. 2F (hex) is the data port. You must first write an address value into
address port 2E (hex), then write/read data to/from the assigned register through
data port 2F (hex).
Summary of Contents for PCA-6742 Series
Page 1: ...User Manual PCA 6742 Half Size CPU Card ...
Page 18: ...PCA 6742 User Manual 12 ...
Page 19: ...Chapter 3 3 BIOS Operation This chapter describes how to set BIOS configuration data ...
Page 30: ...PCA 6742 User Manual 24 ...
Page 38: ...PCA 6742 User Manual 32 ...
Page 47: ...Appendix C C System Assignments This appendix contains informa tion of all System assignments ...
Page 50: ...PCA 6742 User Manual 44 ...
Page 55: ...Appendix E E Mechanical Drawing ...
Page 57: ...51 PCA 6742 User Manual Appendix E Mechanical Drawing ...
