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PLY: Difference between revisions
From SnesLab
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Stack Addressing|Stack]] (Pull) | ||
|7A | |7A | ||
|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]] | ||
|+ | |+ | ||
| | | | ||
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|} | |} | ||
'''PLY''' (PulL Y) is a 65x instruction that pulls the value at the top of the [[stack]] into the [[Y index register]]. | '''PLY''' (PulL Y) is a 65x instruction that pulls the value at the top of the [[stack]] into the [[Y index register]]. PLY increments the [[stack pointer]] before the pull. | ||
===== Cycle Penalty ===== | |||
* PLY takes one additional cycle if the index registers are 16 bits wide. | |||
=== See Also === | === See Also === | ||
* [[PLX]] | * [[PLX]] | ||
* [[PLA]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on PLY: https://archive.org/details/0893037893ProgrammingThe65816/page/n514 | * [[Eyes & Lichty]] page 488, on PLY: https://archive.org/details/0893037893ProgrammingThe65816/page/n514 | ||
* [[Labiak]] page on PLY: https://archive.org/details/Programming_the_65816/page/ | * [[Labiak]] page 172 on PLY: https://archive.org/details/Programming_the_65816/page/n182 | ||
* snes9x implementation of PLY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1921 | * snes9x implementation of PLY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1921 | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c02 additions]] | [[Category:65c02 additions]] | ||
[[Category:Pull Instructions]] | |||
[[Category:One-byte Instructions]] | |||
[[Category:Four-cycle Instructions]] | |||
Latest revision as of 12:30, 14 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Pull) | 7A | 1 byte | 4 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | |||
PLY (PulL Y) is a 65x instruction that pulls the value at the top of the stack into the Y index register. PLY increments the stack pointer before the pull.
Cycle Penalty
- PLY takes one additional cycle if the index registers are 16 bits wide.
See Also
External Links
- Eyes & Lichty page 488, on PLY: https://archive.org/details/0893037893ProgrammingThe65816/page/n514
- Labiak page 172 on PLY: https://archive.org/details/Programming_the_65816/page/n182
- snes9x implementation of PLY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1921