359
Chapter 12
Watchdog Timer Function
Preliminary User’s Manual U15839EE1V0UM00
12.3 Watchdog Timer Control Register
The registers to control the watchdog timer is shown below.
• Watchdog timer clock selection register (WDCS)
• Watchdog timer mode register (WDTM)
(1)
Watchdog timer clock selection register (WDCS)
This register selects the overflow times of the watchdog timer.
WDCS is set by an 8-bit memory manipulation instruction.
Figure 12-2:
Watchdog Timer Clock Selection Register (WDCS)
Note: This are only 2 examples for f
WD
. The clock depends on the clock tree settings and the external
main oscillator resonators (4 or 5 MHz).
7
6
5
4
3
2
1
0
Address
R/W
After reset
WDCS
0
0
0
0
0
WDCS2 WDCS1 WDCS0 FFFF F571H
R/W
00H
WDCS2
WDCS1
WDCS0
Clock
Overflow Time
Note
f
WD
= f
X
4 MHz (main clock)
f
WD
= f
XT
32 KHz (sub clock)
0
0
0
2
13
/f
WD
2 ms
256 ms
0
0
1
2
14
/f
WD
4.1 ms
512 ms
0
1
0
2
15
/f
WD
8.2 ms
1.02 s
0
1
1
2
16
/f
WD
16.4 ms
2.05 s
1
0
0
2
17
/f
WD
32.8 ms
4.10 s
1
0
1
2
18
/f
WD
65.5 ms
8.20 s
1
1
0
2
19
/f
WD
131 ms
16.38 s
1
1
1
2
21
/f
WD
524 ms
65.54 s
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