Datasheet

215
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
12.9.1.12 System Handler Control and State Register
Name: SCB_SHCSR
Access: Read/Write
Reset: 0x000000000
The SHCSR enables the system handlers, and indicates the pending status of the bus fault, memory management fault, and SVC
exceptions; it also indicates the active status of the system handlers.
• USGFAULTENA: Usage Fault Enable
0: Disables the exception.
1: Enables the exception.
• BUSFAULTENA: Bus Fault Enable
0: Disables the exception.
1: Enables the exception.
• MEMFAULTENA: Memory Management Fault Enable
0: Disables the exception.
1: Enables the exception.
• SVCALLPENDED: SVC Call Pending
Read:
0: The exception is not pending.
1: The exception is pending.
Note: The user can write to these bits to change the pending status of the exceptions.
• BUSFAULTPENDED: Bus Fault Exception Pending
Read:
0: The exception is not pending.
1: The exception is pending.
Note: The user can write to these bits to change the pending status of the exceptions.
• MEMFAULTPENDED: Memory Management Fault Exception Pending
Read:
0: The exception is not pending.
31 30 29 28 27 26 25 24
–
23 22 21 20 19 18 17 16
– USGFAULTENA BUSFAULTENA MEMFAULTENA
15 14 13 12 11 10 9 8
SVCALLPENDE
D
BUSFAULTPEN
DED
MEMFAULTPEN
DED
USGFAULTPEN
DED
SYSTICKACT PENDSVACT – MONITORACT
76543210
SVCALLACT – USGFAULTACT – BUSFAULTACT MEMFAULTACT