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Chapter 33 Software Watchdog Timer (SWT)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
921
period. If the service sequence is not written before the second consecutive time-out, the SWT generates
a system reset. The interrupt is indicated by the time-out interrupt flag (SWT_IR[TIF]). The interrupt
request is cleared by writing a one to the SWT_IR[TIF] bit.
The SWT_CO register shows the value of the down counter when the watchdog is disabled. When the
watchdog is enabled this register is cleared. The value shown in this register can lag behind the value in
the internal counter for as long as 6 system plus 8 counter clock cycles.
The SWT_CO can be used during a software self test of the SWT. For example, the SWT can be enabled
and not serviced for a fixed period of time less than the time-out value. Then the SWT can be disabled
(SWT_CR[WEN] cleared) and the value of the SWT_CO read to determine if the internal down counter
is working properly.
NOTE
Watchdog is disabled at the start of BAM execution. In the case of an
unexpected issue during BAM execution, the CPU may be stalled and an
external reset needs to be generated to recover.
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