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PLA: Difference between revisions
From SnesLab
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'''PLA''' (PulL Accumulator) is a 65x instruction that pulls the value at the top of the [[stack]] into the [[accumulator]]. PLA increments the [[stack pointer]] before the pull. | '''PLA''' (PulL Accumulator) is a 65x instruction that pulls the value at the top of the [[stack]] into the [[accumulator]]. PLA increments the [[stack pointer]] before the pull. | ||
The Eyes & Lichty page on PLA has a typo that says the 65x pull instructions "set" the zero and negative flags; it should say "affect." | |||
===== Cycle Penalty ===== | ===== Cycle Penalty ===== | ||
Latest revision as of 06:11, 19 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Pull) | 68 | 1 byte | 4 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | |||
PLA (PulL Accumulator) is a 65x instruction that pulls the value at the top of the stack into the accumulator. PLA increments the stack pointer before the pull.
The Eyes & Lichty page on PLA has a typo that says the 65x pull instructions "set" the zero and negative flags; it should say "affect."
Cycle Penalty
- PLA takes one extra cycle if the accumulator is 16 bits wide.
See Also
External Links
- Eyes & Lichty page 483, on PLA: https://archive.org/details/0893037893ProgrammingThe65816/page/n509
- Labiak page 167 on PLA: https://archive.org/details/Programming_the_65816/page/n177
- MCS6500 Manual page 118 on PLA: https://archive.org/details/mos_microcomputers_programming_manual/page/n137
- Carr page 268 on PLA: https://archive.org/details/6502UsersManual/page/n281
- Leventhal page 3-83 on PLA: https://archive.org/details/6502-assembly-language-programming/page/n132
- snes9x implementation of https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1982