PXS20RM Datasheet, PDF (535/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Fault Collection and Control Unit (FCCU)
— time-out running
• Chip mode: RUN
• Alarm interrupt management
— FAULT recovery (by SW): FCCU state transition ALARM  NORMAL
Non-critical fault event
SW ALARM recovery
Chip mode
RUN
FCCU state
Alarm interrupt
request
NORMAL
ALARM
NORMAL
NCF timer
IDLE
TIMER ON
IDLE
FCCU reset
Figure 22-30. Non-critical FAULT (ALARM state) recovery (a)
Non-critical fault event
Chip mode
RUN
FCCU state
Alarm interrupt
request
NCF timer
NORMAL
IDLE
ALARM
TIMER ON
NORMAL
IDLE
FCCU reset
Figure 22-31. Non-critical FAULT (ALARM state) recovery (b)
A typical sequence related to a non-critical FAULT management (ALARM  FAULT state), given in
Figure 22-32, is following described:
• Non-critical fault assertion
• FCCU state transition (automatic): NORMAL  ALARM
— Alarm interrupt request
— Time-out running
• FCCU state transition (following the time-out trigger): ALARM  FAULT
— NMI assertion
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
22-35