14-6
MC9328MX1 Reference Manual
MOTOROLA
Watchdog Timer Module
14.7 Programming Model
The watchdog timer has three registers in its programming model: Watchdog Control Register (WCR),
Watchdog Service Register (WSR), and Watchdog Status Register (WSTR).
.
14.7.1 Watchdog Control Register
The WCR is a 32-bit read/write (byte writable) register. It controls the Watchdog operation. See
Table 14-2 on page 14-6 for bit descriptions and settings.
Name
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
WCR
($00201000)
R
0
WT[6:0]
0
0
0
WIE
TMD SWR WDEC WDE
W
WHA
LT
WSR
($00201004)
R
WSR[15:0]
W
WSTR
($00201008)
R
0
0
0
0
0
0
0
TINT
0
0
0
0
0
0
0
TOUT
W
WCR
Watchdog Control Register
Addr
0x00201000
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
WHALT
WT
WIE
TMD
SWR
WDEC
WDE
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
r
r
r
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 14-2. Watchdog Control Register Description
Name
Description
Settings
Reserved
Bits
31–15
Reserved—These bits are reserved and should read 0.
WHALT
Bit 15
Watchdog Halt
—When set, the watchdog counter immediately
stops counting and the counter value is held at the last value.
The WHALT bit can be cleared by writing 0 to it or it can be
automatically cleared by the occurrence of any of three system
events, fast interrupt, slow interrupt, or system reset.
0 = Counter is not halted
1 = Counter is halted
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