PXS20RM Datasheet, PDF (538/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Fault Collection and Control Unit (FCCU)
— FAULT (NCF) recovery (by SW): FCCU state transition ALARM  NORMAL
Critical fault event
SW CF
recovery
SW NCF
recovery
Non-critical fault event
Chip mode
RUN
SAFE
RUN
FCCU state
Alarm interrupt
request
NORMAL
NCF timer
Short or long ‘functional’
reset request
SAFE mode request
IDLE
ALARM
FAULT
TIMER ON
ALARM
NORMAL
IDLE
NMI
FCCU_F
IDLE
ERROR ON
IDLE
FCCU reset
Figure 22-34. Critical FAULT (and non-critical FAULT nesting) recovery
22.7.7 WKUP/NMI interface
The NMI signal internally generated by FCCU is masked when:
• FCCU asynchronous reset
• Chip mode = RESET
and un-masked when:
• A SW change request of the chip mode is triggered
The logical scheme is given in Figure 22-35.
22-38
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor