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4.3.7. Configuration and Control Register

The CCR is a read-only register and indicates some aspects of the behavior of the Cortex-M0+ processor. See the register summary in Table 4.9 for the CCR attributes.

The bit assignments are:

Table 4.15. CCR bit assignments
BitsNameFunction
[31:10]-Reserved.
[9]STKALIGN

Always reads as one, indicates 8-byte stack alignment on exception entry.

On exception entry, the processor uses bit[9] of the stacked PSR to indicate the stack alignment. On return from the exception it uses this stacked bit to restore the correct stack alignment.

[8:4]-Reserved.
[3]UNALIGN_TRP

Always reads as one, indicates that all unaligned accesses generate a HardFault.

[2:0]-Reserved.

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