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Chapter 33 Software Watchdog Timer (SWT)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
917
33.5.2.3
SWT Time-Out Register (SWT_TO)
The SWT Time-Out (SWT_TO) register contains the 32-bit time-out period. The reset value for this
register is device specific. If either the SWT_CR[HLK] or the SWT_CR[SLK] bit is set, this register is
read-only.
Figure 33-3. SWT Time-Out Register (SWT_TO)
The default counter value (SWT_TO_RST) is 1280 (0x0000_0500 hexadecimal), which corresponds to
around 10 ms with a 128 kHz clock.
33.5.2.4
SWT Window Register (SWT_WN)
The SWT Window (SWT_WN) register contains the 32-bit window start value. This register is cleared on
reset. If either the SWT_CR[HLK] or the SWT_CR[SLK] bit is set, this register is read-only.
Figure 33-4. SWT Window Register (SWT_WN)
Table 33-3. SWT_IR field descriptions
Field
Description
TIF
Time-out Interrupt Flag. The flag and interrupt are cleared by writing a 1 to this bit. Writing a 0 has
no effect.
0 No interrupt request.
1 Interrupt request due to an initial time-out.
Address: Base + 0x0008
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
WTO
W
Reset 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0 0
0
1
0
1
0
0
0
0
0
0
0
0
Table 33-4. SWT_TO Register field descriptions
Field
Description
WTO
Watchdog time-out period in clock cycles. When the service sequence is written or when the SWT is
enabled, an internal 32-bit down counter is loaded with the greater of this value or 0x100.
Address: Base + 0x000C
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
WST
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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