PXS20RM Datasheet, PDF (534/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Fault Collection and Control Unit (FCCU)
Critical fault event
SW FAULT recovery
Chip mode
RUN
RESET
SAFE
RUN
FCCU state
Short ‘functional’
reset request
SAFE mode request
NMI
NORMAL
delay
FAULT
NORMAL
FCCU_F
IDLE
ERROR ON
IDLE
FCCU reset
Figure 22-28. Critical FAULT recovery (a)
Critical fault event
Chip mode
RUN
RESET
SAFE
RUN
FCCU state
Short ‘functional’
reset request
SAFE mode request
NMI
NORMAL
delay
FAULT
NORMAL
FCCU_F
IDLE
ERROR ON
IDLE
FCCU reset
Figure 22-29. Critical FAULT recovery (b)
A typical sequence related to a non-critical FAULT management (ALARM state), given in Figure 22-30
and Figure 22-31, is following described:
• Non-critical fault assertion
• FCCU state transition (automatic): NORMAL  ALARM
— alarm interrupt request
22-34
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor