Boser HS-2604, Руководство пользователя

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24
Connector JP3 Orientation
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
PWR LED
PWR button
SLP button
EXT_SMI
HD_LED
RST_SW
SPEAKER
3.20 Watchdog Timer
There are three access cycles of Watch-Dog Timer as Enable, Refresh
and Disable are the three access cycles of Watchdog Timer. The
Enable cycle proceeds via READ PORT 443H whereas the Disable
cycle proceeds via READ PORT 045H. A continued Enable cycle after
a first Enable cycle means Refresh.
Once the Enable cycle is active, a Refresh cycle is requested before
the time-out period. This restarts counting of the WDT period. When
the time counting goes over the period preset of WDT, it will assume
that the program operation is abnormal. A System Reset signal to
re-start or a NMI cycle to the CPU transpires when such error happens.
Jumper
JP1 is used to select the function of Watchdog Timer.
JP1
:
Watchdog Timer Active Type Setting
Options Settings
Active NMI Short 1-2
System Reset Short 2-3
Disabled Watchdog Timer Open
1 3
JP4(5-10): WDT Timeout Period Select
Period PINS 5-6 PINS 7-8 PINS 9-10
1 sec Short Short Short
2 sec Open Short Short
10 sec Short Open Short
20 sec Open Open Short
110 sec Short Short Open
220 sec Open Short Open