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ITA-1710 User Manual
62
A.1
Programming the Watchdog Timer
The ITA-1710'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.
A.1.1
Watchdog Timer Overview
The watchdog timer is built into the super I/O controller SMSC SCH3114. It provides
the following user-programmable functions:
Can be enabled or disabled via user program
Timer can be set from 1 to 255 seconds or 1 to 255 minutes
Generates an interrupt or resets signal if the software fails to reset the timer
before time-out
A.1.2
Programming the Watchdog Timer
The I/O port address of the watchdog timer is A00h (hex).
Table A.1: Watchdog Timer Registers
Address: A00h (hex)
Register Shift Read/Write
Description
65 (hex)
write
Set seconds or minutes as units for the timer.
Write 0 to bit 7: set second as counting unit. [default]
Write 1 to bit 7: set minutes as counting unit.
66 (hex)
write
0: Stop timer [default]
01~FF (hex): The amount of the count, in seconds or min-
utes, depends on the value set in register 65 (hex). This
number 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.
67 (hex)
read/write
Configure watchdog timer
Bit 1:Write 1 to enable keyboard to reset the timer, 0 to dis-
able. [default]
Bit 2: Write 1 to enable mouse to reset the timer, 0 to dis-
able.[default]
Bit 7~4: Set the interrupt mapping of watchdog timer:
1111=IRQ15
……
0011=IRQ3
0010=IRQ2
0001=IRQ1
0000=Disable [default]
68 (hex)
read/write
Control watchdog timer
Bit0: Read watchdog state; 1=Timer timeout
Bit2: Write 1 to immediately generate timeout signal, and
automatically return to 0 (Write only).
Bit3: Writer 1 to allow triggering of timer timeout when P20
is effective, 0 to disable. [default]
Summary of Contents for ITA-1710
Page 1: ...User Manual ITA 1710 Fanless Embedded Atom Dual Core Compact Industrial Computer...
Page 10: ...ITA 1710 User Manual x...
Page 11: ...Chapter 1 1 Overview This chapter provider general Information about the ITA 1710...
Page 15: ...Chapter 2 2 H W Installation This chapter provides H W Instal lation about the ITA 1710...
Page 26: ...ITA 1710 User Manual 16...
Page 27: ...Chapter 3 3 System Setup This chapter introduces the instal lation process of ITA 1710...
Page 34: ...ITA 1710 User Manual 24...
Page 35: ...Chapter 4 4 AMI BIOS This chapter introduces how to configure AMI BIOS...
Page 62: ...ITA 1710 User Manual 52...
Page 63: ...Chapter 5 5 Driver Installation This chapter describes how to Install drivers...
Page 67: ...Chapter 6 6 GPIO Programming Guide This chapter introduces GPIO pro gramming Guide...
Page 70: ...ITA 1710 User Manual 60...