We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
Block Move Addressing: Difference between revisions
From SnesLab
(what accum will contain when done) |
(what happens to index regs when done) |
||
| Line 6: | Line 6: | ||
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. | 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 | 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 | |||
==== Syntax ==== | ==== Syntax ==== | ||
Revision as of 02:19, 14 July 2024
Two instructions use Block Move Addressing on the 65c816:
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
Syntax
Asar:
MVN srds
References
- Eyes & Lichty, page 388: https://archive.org/details/0893037893ProgrammingThe65816/page/388
- "Block Moves" on page 103, lbid: https://archive.org/details/0893037893ProgrammingThe65816/page/103
- section 3.5.9 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf