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PLD: Difference between revisions
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{| class="wikitable" style="float:right;clear:right;width: | {| class="wikitable" style="float:right;clear:right;width:40%" | ||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Stack Addressing|Stack]] (Pull) | ||
|2B | |2B | ||
|1 byte | |1 byte | ||
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!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
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|[[Negative Flag|N]] | |||
|[[Overflow Flag|V]] | |||
|[[M Flag|M]] | |||
|[[X Flag|X]] | |||
|[[Decimal Flag|D]] | |||
|[[I Flag|I]] | |||
|[[Zero Flag|Z]] | |||
|[[Carry Flag|C]] | |||
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|N | |N | ||
|. | |. | ||
|. | |. | ||
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| | |Z | ||
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'''PLD''' (PulL Direct page) is a [[65c816]] instruction that pulls the 16-bit value at the top of the [[stack]] into the [[direct page register]]. | '''PLD''' (PulL Direct page) is a [[65c816]] instruction that pulls the 16-bit value at the top of the [[stack]] into the [[direct page register]], relocating the [[direct page]]. The low byte of this register is pulled first and then the high byte. The [[stack pointer]] is incremented by two and ends up pointing to where the high byte was, which becomes the next available stack location. | ||
==== Syntax ==== | |||
<pre> | |||
PLD | |||
</pre> | |||
PLD works even in [[emulation mode]], and instructions that used [[zero page addressing]] on the 6502 will use [[direct page addressing]] instead with the direct offset still added into their effective address. | |||
=== See Also === | |||
* [[PHD]] | |||
* [[PLB]] | |||
* [[PLX]] | |||
* [[PLY]] | |||
* [[TCD]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/485 page 485] on PLD | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n179 page 169] on PLD | ||
* snes9x implementation of PLD: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2069 | * snes9x implementation of PLD: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2069 | ||
* Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.3 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c816 additions]] | [[Category:65c816 additions]] | ||
[[Category:Pull Instructions]] | |||
[[Category:Five-cycle Instructions]] | |||
Latest revision as of 01:25, 13 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Pull) | 2B | 1 byte | 5 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| N | . | . | . | . | . | Z | . | |
PLD (PulL Direct page) is a 65c816 instruction that pulls the 16-bit value at the top of the stack into the direct page register, relocating the direct page. The low byte of this register is pulled first and then the high byte. The stack pointer is incremented by two and ends up pointing to where the high byte was, which becomes the next available stack location.
Syntax
PLD
PLD works even in emulation mode, and instructions that used zero page addressing on the 6502 will use direct page addressing instead with the direct offset still added into their effective address.
See Also
External Links
- Eyes & Lichty, page 485 on PLD
- Labiak, page 169 on PLD
- snes9x implementation of PLD: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2069
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.3