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Chapter 33 Software Watchdog Timer (SWT)
MPC5606BK Microcontroller Reference Manual, Rev. 2
914
Freescale Semiconductor
33.4
External signal description
The SWT module does not have any external interface signals.
33.5
Memory map and register description
The SWT programming model has six 32-bit registers. The programming model can only be accessed
using 32-bit (word) accesses. References using a different size are invalid. Other types of invalid accesses
include: writes to read only registers, incorrect values written to the service register when enabled,
accesses to reserved addresses, and accesses by masters without permission. If the SWT_CR[RIA] bit 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_SK, and
SWT_WN registers are read-only. point save
33.5.1
Memory map
The SWT memory map is shown in
. The reset values of SWT_CR, SWT_TO, and SWT_WN
are device-specific. These values are determined by SWT inputs.
Table 33-1. SWT memory map
Base address: 0xFFF3_8000
Address offset
Register
Access
1
1
In this column, R/W = Read/Write, R = Read-only, and W = Write-only.
Reset Value
23
2
In this column, the format of the reset value indicates the register width. Thus, reset values of the formats 0xHH,
0xHHHH, and 0xHHHH_HHHH, where H is a hexadecimal digit, indicate 8-, 16-, and 32-bit registers, respectively.
3
In this column, the symbol “U” indicates one or more bits in a byte are undefined at reset. See the associated
description for more information.
Location
0x0000
R/W
0x4000_011U
0x0004
SWT Interrupt Register (SWT_IR)
R/W
0x0000_0000
0x0008
SWT Time-Out Register (SWT_TO)
R/W
0x0000_0500
0x000C
R/W
0x0000_0000
0x0010
W
0x0000_0000
0x0014
SWT Counter Output Register (SWT_CO)
R
0x0000_0000
0x0018
SWT Service Key Register (SWT_SK)
W
0x0000_0000
0x001C–0xFFFF Reserved
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