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MVN
From SnesLab
MVN (Block Move Negative) is a 65c816 instruction that copies a contiguous block of memory. It is intended to copy a block from a higher address to a lower address (moving it in the negative direction).
In Eyes & Lichty, the "N" in the mnemonic stands for "Next" not "Negative."
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| block move | 54 | 3 bytes | 7 cycles per byte moved | ||||
| Flags Clobbered | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
Parameters
- the X index register specifies the starting (lowest) source address of the block
- the Y index register specifies the starting (lowest) destination address of the block
- the C double accumulator specifies the length of the block in bytes minus one
- the first operand byte specifies the destination bank the block will be in
- the second operand byte specifies the source bank the block starts out in
See Also
External Links
- Eyes & Lichty page on MVN: https://archive.org/details/0893037893ProgrammingThe65816/page/n492
- Labiak page on MVN: https://archive.org/details/Programming_the_65816/page/n163
- snes9x implementation of MVN: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3011
- undisbeliever on MVN: https://undisbeliever.net/snesdev/65816-opcodes.html#mvn-block-move-next