ST STM32F4 Series Programming Manual page 235

PM0214
Bit 8 MONITORACT: Debug monitor active bit, reads as 1 if Debug monitor is active
Bit 7 SVCALLACT: SVC call active bit, reads as 1 if SVC call is active
Bits 6:4 Reserved, must be kept cleared
Bit 3 USGFAULTACT: Usage fault exception active bit, reads as 1 if exception is active
Reserved, must be kept cleared
Bit 2
Bit 1 BUSFAULTACT: Bus fault exception active bit, reads as 1 if exception is active
Bit 0 MEMFAULTACT: Memory management fault exception active bit, reads as 1 if exception is
active
1. Enable bits, set to 1 to enable the exception, or set to 0 to disable the exception.
2. Pending bits, read as 1 if the exception is pending, or as 0 if it is not pending. You can write to these bits to change the
pending status of the exceptions.
3. Active bits, read as 1 if the exception is active, or as 0 if it is not active. You can write to these bits to change the active
status of the exceptions, but see the Caution in this section.
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