14-8
MC9328MX1 Reference Manual
MOTOROLA
Watchdog Timer Module
14.7.3 Watchdog Status Register
The WSTR is a read-only register which records the source of the RESET_OUT event and interrupt status.
It is cleared by reset. It records the source of the RESET_OUT event and interrupt status.
RESET_OUT can be generated by the following sources which are listed in priority from highest to
lowest: Power-on reset, External reset, Clock Monitor event, Watchdog Time-out, and Software reset.
.
Table 14-3. Watchdog Service Register Description
Name
Description
Settings
Reserved
Bits 31–16
Reserved—These bits are reserved and should read 0.
WSR[15:0]
Bits 15–0
Watchdog Service Register
—This 15-bit field
contains the watchdog service sequence.
Both writes must occur in the order listed prior to the
time-out, however any number of instructions can be
executed between the two writes.
The service sequence must be performed
as follows:
a)
Write $5555 to the Watchdog
Service Register (WSR).
b)
Write $AAAA to the Watchdog
Service Register (WSR)
WSTR
Watchdog Status Register
Addr
0x00201008
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
TINT
TOUT
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
Table 14-4. Watchdog Status Register Description
Name
Description
Settings
Reserved
Bits 31–9
Reserved—These bits are reserved and should read 0.
TINT
Bit 8
Time-Out Interrupt
—Indicates whether the time-out
interrupt generated
0 = No time-out interrupt generated
1 = Time-out interrupt generated
Reserved
Bits 7–1
Reserved—These bits are reserved and should read 0.
TOUT
Bit 0
Time-Out
—Indicates whether the watchdog timer times
out.
0 = Watchdog timer does not time-out.
1 = Watchdog timer times out.
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