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Block Move Addressing
From SnesLab
Two instructions use Block Move Addressing on the 65c816:
They are both 3 bytes long. The total number of bytes copied is the value in the C accumulator plus one. If a block move is interrupted, the current byte copy is completed, then the interrupt is serviced.
When the copying is complete:
- the accumulator will contain the value $FFFF.
- both index registers will point to the byte one past the end of the blocks they were pointing to
- if the source and destination blocks do not overlap, the source block is still intact
Syntax
Asar:
MVN srds
See Also
References
- Eyes & Lichty, page 388
- "Block Moves" on page 103, lbid
- section 3.5.9 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf