E m b e d d e d B o x P C
B O X E R - 6 4 0 4
A.1 Watchdog Timer Registers
Table 1 : Watch dog relative IO address
Default Value
Note
I/O Base
Address
0xA00
I/O Base address for Watchdog operation.
This address is assigned by SIO LDN7, register 0x60-0x61.
Table 2 : Watchdog relative register table
Register
Offset
BitNum
Value
Note
Watchdog
WDTRST#
Enable
0x00
7
1
Enable/Disable
time out output via
WDTRST#
0: Disable
1: Enable
Pulse Width
0x05
0:1
01
Width of Pulse signal
00: 1ms (do not use)
01: 25ms
10: 125ms
11: 5s
Pulse width is must longer
then 16ms.
Signal Polarity
0x05
2
0
0: low active
1: high active
Must set this bit to 0
Counting Unit
0x05
3
0
Select time unit.
0: second
1: minute
Output Signal
Type
0x05
4
1
0: Level
1: Pulse
Must set this bit to 1
Watchdog
Timer Enable
0x05
5
1
0: Disable
1: Enable
Timeout Status
0x05
6
1
1: timeout occurred. Write a 1
to clear timeout status
Timer Counter
0x06
Time of watchdog timer
(0~255)
Appendix A Programming the Watchdog Timer
A-2
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Summary of Contents for BOXER-6404
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