2.2.1 Write Operation Lost if Consecutive Writes to Specific Address Spaces

An ST/STD/STS instruction to address > = 64 followed by an ST/STD instruction to address < 64 or SLPCTRL.CTRLA will cause a loss of the last write.

Work Around

To avoid loss of write operation, use one of the following workarounds depending on address space:

Insert an NOP instruction before writing to address < 64, or use the OUT instruction instead of ST/STD
Insert an NOP instruction before writing to SLPCTRL.CTRLA

Affected Silicon Revisions


Rev. A0
X

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