12.10 Bit-Band Accesses - ARM Cortex-M3 Technical Reference Manual

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12.10 Bit-band accesses

ARM DDI 0337G

Unrestricted Access

The System bus interface contains logic that controls bit-band accesses as follows:

It remaps bit-band alias addresses to the bit-band region.

For reads, it extracts the requested bit from the read byte, and returns this in the

Least Significant Bit (LSB) of the read data returned to the core.

For writes, it converts the write to an atomic read-modify-write operation.

For more information about bit-banding, see Bit-banding on page 4-5.

The Cortex-M3 core does not stall during bit-band operations unless it attempts

to access the System bus while the bit-band operation is being carried out.

Non-Confidential

Bus Interface