Appendix B: Watchdog; 1.1 Command Register And Address Description; 1.2 Set Up Watchdog Time Interval Description - Nexcom PPC-240T-HW-01 User Manual

Appendix B: Watchdog

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1.1 Command Register and Address Description:

Command Description
0x88 Read watchdog time interval
0x89 Reset watchdog time interval
0x28 Start watchdog
0x29 Stop watchdog
0x2A Reset watchdog
Address for watchdog:
Watchdog is used to set up time interval and also keep event status. Unit
time interval is 1ms. Time setting requires a word (8 bit) long length. You
can set up watchdog event time from 0 to 0xFFFFFFFE. Write 0xFFFFFFFF to
time interval setting means disable watchdog event. The interval time range
is from 0ms to 497 day (0~0x0xFFFFFFFE)
Address Description
0x50-0x53 0~0xFFFFFFFE
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atChdog

1.2 Set up Watchdog Time Interval Description:

Step Action
0 Wait IBF clear
Write 0x89 to
1
0x66
2 Wait IBF clear
Write RAM
3 address to 0x62
port
4 Wait OBF set
Write watchdog
5 time interval
value to 0x62
Sample explanation:
To set up watchdog time interval to 4 seconds, here are the values that
should be filled in each address.
4sec = 400ms (decimal) = 190 (hexadecimal)
Address 0x50
Data
0x00
64
RW Sample
Description
Code Command
x
Send read command >o 0x66 0x89
x
Send Watchdog address
>o 0x62 0x50
0x50~0x53.
x
Values from
0~0x0xFFFFFFFE, but
two bit in each address, >o 0x62 0x90
please refer to sample
code explanation.
0x51 0x52 0x53
0x00 0x01 0x90
(M)PPC-240T-HW-01 User Manual