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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

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.


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


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