Watch-Dog Timer - Boser HS-6301 Manual

2.9 Watch-Dog Timer

There are three access cycles of Watch-Dog Timer: Enable, Refresh and
Disable. The Enable cycle should proceed by READ PORT 443H. The
Disable cycle after a first Enable cycle means Refresh.
Once the Enable cycle is active, a Refresh cycle is requested before the
time-out period to restart counting the WDT's period. Otherwise, it will
assume that the program operation is abnormal when the time counting is
over and the period preset of WDT Timer. A system reset signal to start
again or a NMI cycle to the CPU comes if over.
JP6 is used to select the active function of Watch-Dog Timer in disable the
Watch-Dog Timer, or presetting the Watch-Dog Timer activity at the reset
trigger, or at the NMI trigger.
JP7(5-10)： Time of Watch-Dog
??
JP6： Watch-Dog Active Setting
??
The Watch-Dog Timer is disabled after the system Power On. The
Watch-Dog Timer can be enabled by a Enable cycle with reading the
control port (443H), a Refresh cycle with reading the control port (443H)
and a Disable cycle by reading the Watch-Dog Timer disable control
Period 5-6
*1 sec ON
2 sec OFF
10 sec ON
20 sec OFF
110 sec ON
220 sec OFF
JP6
1-2
*2-3
OFF
7-8
ON
ON
OFF
OFF
ON
ON
Description
Active NMI
System Reset
Disable
9-10
ON
ON
ON
ON
OFF
OFF
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