Datasheet

221
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
12.9.1.14 Configurable Fault Status Register (Byte Access)
Name: SCB_CFSR (BYTE)
Access: Read/Write
Reset: 0x000000000
• MMFSR: Memory Management Fault Status Subregister
The flags in the MMFSR subregister indicate the cause of memory access faults. See bitfield [7..0] description in Section
12.9.1.13.
• BFSR: Bus Fault Status Subregister
The flags in the BFSR subregister indicate the cause of a bus access fault. See bitfield [14..8] description in Section 12.9.1.13.
• UFSR: Usage Fault Status Subregister
The flags in the UFSR subregister indicate the cause of a usage fault. See bitfield [31..15] description in Section 12.9.1.13.
Note: The UFSR bits are sticky. This means that as one or more fault occurs, the associated bits are set to 1. A bit that is set
to 1 is cleared to 0 only by wrting a 1 to that bit, or by a reset.
The SCB_CFSR indicates the cause of a memory management fault, bus fault, or usage fault. It is byte accessible. The user can
access the SCB_CFSR or its subregisters as follows:
• Access complete SCB_CFSR with a word access to 0xE000ED28
• Access MMFSR with a byte access to 0xE000ED28
• Access MMFSR and BFSR with a halfword access to 0xE000ED28
• Access BFSR with a byte access to 0xE000ED29
• Access UFSR with a halfword access to 0xE000ED2A.
31 30 29 28 27 26 25 24
UFSR
23 22 21 20 19 18 17 16
UFSR
15 14 13 12 11 10 9 8
BFSR
76543210
MMFSR