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Block Move Addressing

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Two instructions use Block Move Addressing on the 65c816:

MVP (opcode 44)
MVN (opcode 54)

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.

Reference

Eyes & Lichty, page 388: https://archive.org/details/0893037893ProgrammingThe65816/page/n414

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