
Watchdog Timer Module
Freescale Semiconductor
27-5
27.2.4
Watchdog Service Register (WSR)
When the watchdog timer is enabled, writing 0x5555 and then 0xAAAA to WSR before the watchdog
counter times out prevents a reset. If WSR is not serviced before the timeout, the watchdog timer sends a
signal to the reset controller module that sets the RSR[WDR] bit and asserts a system reset.
Both writes must occur in the order listed before the timeout, but any number of instructions can be
executed between the two writes. However, writing any value other than 0x5555 or 0xAAAA to WSR
resets the servicing sequence, requiring both values to be written to keep the watchdog timer from causing
a reset.
Address: 0xFC09_8006
Access: User read/write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
WS
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 27-5. Watchdog Service Register (WSR)
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...