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Chapter 33 Software Watchdog Timer (SWT)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
915
33.5.2
Register description
33.5.2.1
SWT Control Register (SWT_CR)
The SWT_CR contains fields for configuring and controlling the SWT. The reset value of this register is
device specific. Some devices can be configured to automatically clear the SWT_CR[WEN] bit during the
boot process. If either the SWT_CR[HLK] or the SWT_CR[SLK] bit is set, this register is read-only.
Figure 33-1. SWT Control Register (SWT_CR)
This last bit is cleared when exiting ME RESET mode in case flash user option bit 31 (WATCHDOG_EN)
is 0.
Address: Base + 0x0000
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R MAP
0
MAP
1
MAP
2
MAP
3
MAP
4
MAP
5
MAP
6
MAP
7
0
0
0
0
0
0
0
0
W
Reset
1
1
The reset value for the SWT_CR is device-specific.
1
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
KEY
RIA WND ITR
HLK
SLK
CSL
STP
FRZ WEN
W
Reset
0
0
0
0
0
0
0
1
0
0
0
1
1
0
1
_
Table 33-2. SWT_CR field descriptions
Field
Description
MAP
n
Master Access Protection for Master
n
.
Allows specific master to update watchdog. MAP0 = CPU, MAP2 = eDMA.
The platform bus master assignments are device-specific.
0 Access for the master is not enabled
1 Access for the master is enabled
KEY
Keyed Service Mode.
0 Fixed Service Sequence, the fixed sequence 0xA602, 0xB480 is used to service the watchdog.
1 Keyed Service Mode, two pseudorandom key value are used to service the watchdog.
RIA
Reset on Invalid Access.
0 Invalid access to the SWT generates a bus error.
1 Invalid access to the SWT causes a system reset if WEN = 1.
WND
Window Mode.
0 Regular mode, service sequence can be done at any time.
1 Windowed mode, the service sequence is only valid when the down counter is less than the value
in the SWT_WN register.
ITR
Interrupt Then Reset.
0 Generate a reset on a time-out.
1 Generate an interrupt on an initial time-out, reset on a second consecutive time-out.
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