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PLA: Difference between revisions
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Stack Addressing|Stack]] (Pull) | ||
|68 | |68 | ||
|1 byte | |1 byte | ||
|4 cycles | |4 cycles* | ||
|} | |} | ||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[Decimal Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
| | | | ||
| Line 35: | Line 35: | ||
|} | |} | ||
'''PLA''' (PulL Accumulator) is a 65x instruction that pulls the value at the top of the [[stack]] into the [[accumulator]]. | '''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 === | === See Also === | ||
* [[PLX]] | * [[PLX]] | ||
* [[PLY]] | * [[PLY]] | ||
* [[PHA]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on PLA: https://archive.org/details/0893037893ProgrammingThe65816/page/n509 | * [[Eyes & Lichty]] page 483, on PLA: https://archive.org/details/0893037893ProgrammingThe65816/page/n509 | ||
* [[Labiak]] page on PLA: https://archive.org/details/Programming_the_65816/page/n177 | * [[Labiak]] page 167 on PLA: https://archive.org/details/Programming_the_65816/page/n177 | ||
* [[MCS6500 Manual]] page on PLA: https://archive.org/details/mos_microcomputers_programming_manual/page/n137 | * [[MCS6500 Manual]] page 118 on PLA: https://archive.org/details/mos_microcomputers_programming_manual/page/n137 | ||
* [[Carr]] page on PLA: https://archive.org/details/6502UsersManual/page/n281 | * [[Carr]] page 268 on PLA: https://archive.org/details/6502UsersManual/page/n281 | ||
* [[Leventhal]] page on PLA: https://archive.org/details/6502-assembly-language-programming/page/n132 | * [[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 | * snes9x implementation of https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1982 | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
[[Category:Pull Instructions]] | |||
[[Category:One-byte Instructions]] | |||
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