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Chapter 33 Software Watchdog Timer (SWT)
MPC5606BK Microcontroller Reference Manual, Rev. 2
918
Freescale Semiconductor
33.5.2.5
SWT Service Register (SWT_SR)
The SWT Time-Out (SWT_SR) service register is the target for service sequence writes used to reset the
watchdog timer.
Figure 33-5. SWT Service Register (SWT_SR)
33.5.2.6
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.
Figure 33-6. SWT Counter Output Register (SWT_CO)
Table 33-5. SWT_WN Register field descriptions
Field
Description
WST
Window start value. When window mode is enabled, the service sequence can only be written when
the internal down counter is less than this value.
Address: Base + 0x0010
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 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
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
0
0 0 0
0
0
0
0
0
0
0
0
0
0
0
0
Table 33-6. 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]). To service the watchdog, the value 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.
Address: Base + 0x0014
Access: User read-only
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 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
0
0 0 0
0
0
0
0
0
0
0
0
0
0
0
0
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