XC886/888CLM
Watchdog Timer
User’s Manual
9-4
V1.3, 2010-02
Watchdog Timer, V1.0
lists the possible ranges for the watchdog time which can be achieved using
a certain module clock. Some numbers are rounded to 3 significant digits.
Note: For safety reasons, the user is advised to rewrite WDTCON each time before the
WDT is serviced.
9.1.1
Module Suspend Control
The WDT is by default suspended on entering debug mode. The WDT can be allowed
to run in debug mode by clearing the bit WDTSUSP in SFR MODSUSP to 0.
Table 9-1
Watchdog Time Ranges
Reload value in
WDTREL
Prescaler for
f
WDT
2 (WDTIN = 0)
128 (WDTIN = 1)
24 MHz
16 MHz
12 MHz
24 MHz
16 MHz
12 MHz
FF
H
21.3
µ
s
32.0
µ
s
42.67
µ
s 1.37 ms
2.05 ms
2.73 ms
7F
H
2.75 ms
4.13 ms
5.5 ms
176 ms
264 ms
352 ms
00
H
5.46 ms
8.19 ms
10.92 ms 350 ms
524 ms
699 ms
MODSUSP
Module Suspend Control Register
Reset Value: 01
H
7
6
5
4
3
2
1
0
0
T21SUSP
T2SUSP
T13SUSP
T12SUSP WDTSUSP
r
r
r
rw
rw
rw
rw
rw
Field
Bits
Type Description
WDTSUSP
0
rw
WDT Debug Suspend Bit
0
WDT will not be suspended.
1
WDT will be suspended.
0
[7:5]
r
Reservedl
Returns 0 if read; should be written with 0.
*
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