1.3.1 Example: chip-specific information that supersedes
content in the same chapter
The example below shows chip-specific information that supersedes general module
information presented later in the chapter. In this case, the chip-specific register reset
values supersede the reset values that appear in the register diagram.
Chapter 34
Software Watchdog Timer (SWT)
34.1 Chip-specific SWT information
This chip has two instances of the SWT module: SWT_A and SWT_B.
34.1.1 SWT register reset values
The following table identifies chip-specific reset values of SWT registers.
Table 34-1. Chip-specific SWT register reset values
Register
SWT_A
SWT_B
CR
FF00_010Bh
FF00_010Ah
TO
0005_FCD0h
0005_FCD0h
34.2 Introduction
Sample Reference Manual
This section provides an overview, list of features, and modes of operation for the SWT.
The Software Watchdog Timer (SWT) is a peripheral module that can prevent system
lockup in situations such as software getting trapped in a loop or if a bus transaction fails
to terminate. When enabled, the SWT requires periodic execution of a watchdog
servicing operation. The servicing operation resets the timer to a specified time-out
period. If this servicing action does not occur before the timer expires the SWT generates
an interrupt or hardware reset. The SWT can be configured to generate a reset or interrupt
on an initial time-out. A reset is always generated on a second consecutive time-out.
34.2.1 Overview
accesses by masters without permission. If the RIA bit in the SWT_CR is set then the
SWT generates a system reset on an invalid access otherwise a bus error is generated. If
either the HLK or SLK bits in the SWT_CR are set, then the SWT_CR, SWT_TO,
SWT_WN, and SWT_SK registers are read-only.
The SWT memory map is shown in the following table.
SWT memory map
Address
offset (hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
0
SWT Control Register (SWT_CR)
32
R/W
See section 34.4.1/1331
4
SWT Interrupt Register (SWT_IR)
32
R/W
0000_0000h
34.4.2/1334
8
SWT Time-out Register (SWT_TO)
32
R/W
See section 34.4.3/1334
C
SWT Window Register (SWT_WN)
32
R/W
0000_0000h
34.4.4/1335
10
SWT Service Register (SWT_SR)
32
W
0000_0000h
34.4.5/1335
14
SWT Counter Output Register (SWT_CO)
32
R
0000_0000h
34.4.6/1336
18
SWT Service Key Register (SWT_SK)
32
R/W
0000_0000h
34.4.7/1336
34.4.1 SWT Control Register (SWT_CR)
NOTE
The reset value for the SWT_CR is implementation specific.
See the configuration information.
The SWT_CR contains fields for configuring and controlling the SWT.
This register is read-only if either the SWT_CR[HLK] or SWT_CR[SLK] bits are set.
Address: 0h base + 0h offset = 0h
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
MAP0
MAP1
MAP2
MAP3
MAP4
MAP5
MAP6
MAP7
0
W
Reset
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
Bit
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
SMD
RIA
WND
ITR
HLK
SLK
CSL
STP
FRZ WEN
W
Reset
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
0*
* Notes:
The reset value for the SWT_CR is implementation specific. See the configuration information.
•
Chapter 34 Software Watchdog Timer (SWT)
Sample Reference Manual
EXAMPLE
Figure 1-2. Example: chip-specific information that supersedes content in the same
chapter
1.3.2 Example: chip-specific information that refers to a different
chapter
The chip-specific information below refers to another chapter's chip-specific information.
In this case, read both sets of chip-specific information before reading further in the
chapter.
Chapter 1 About This Manual
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
49
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