Software Watchdog Timer (SWT)
PXN20 Microcontroller Reference Manual, Rev. 1
20-6
Freescale Semiconductor
20.3.2.5
SWT Service Register (SWT_SR)
The SWT Time-Out (SWT_SR) service register is the target for service operation writes used to reset the
watchdog timer.
20.3.2.6
SWT Counter Output Register (SWT_CO)
The SWT Counter Output (SWT_CO) register is a read-only register that shows the value of the internal
down counter when the SWT is disabled.
Offset: SW 0x0010
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
WSC
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 20-5. SWT Service Register (SWT_SR)
Table 20-6. SWT_SR Field Descriptions
Field
Description
WSC
Watchdog Service Code.This field is used to service the watchdog and to clear the soft lock bit (SWT_CR[SLK]). If
the SWT_CR[KEY] bit is set, two pseudorandom key values are written to service the watchdog, see Section
Section 20.4, Functional Description,
for details. Otherwise, the sequence 0xA602 followed by 0xB480 is written to
the WSC field. To clear the soft lock bit (SWT_CR[SLK]), the value 0xC520 followed by 0xD928 is written to the WSC
field.
Offset: SW 0x0014
Access: User read-only
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
CNT
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
CNT
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 20-6. SWT Counter Output Register (SWT_CO)
Summary of Contents for PXN2020
Page 1: ...PXN20 Microcontroller Reference Manual Devices Supported PXN2020 PXN2120 PXN20RM Rev 1 06 2011...
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Page 112: ...Signal Description PXN20 Microcontroller Reference Manual Rev 1 3 44 Freescale Semiconductor...
Page 118: ...Resets PXN20 Microcontroller Reference Manual Rev 1 4 6 Freescale Semiconductor...
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