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PHX: Difference between revisions
From SnesLab
(→See Also: PLX) |
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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''' | ||
|+ | |+ | ||
| | |[[Stack Addressing|Stack]] (Push) | ||
|DA | |DA | ||
|1 byte | |1 byte | ||
|3 cycles | |3 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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|} | |} | ||
'''PHX''' is a [[65c816]] instruction that pushes the value of the [[X index register]] onto the [[stack]]. | '''PHX''' is a [[65c816]] instruction that pushes the value of the [[X index register]] onto the [[stack]]. If X is 16 bits wide, the high byte is pushed first. | ||
The [[stack pointer]] is decremented by the number of bytes X is. | |||
No flags are affected. | |||
==== Syntax ==== | |||
<pre> | |||
PHX | |||
</pre> | |||
==== Cycle Penalty ==== | |||
* PHX takes one additional cycle if the index registers are 16 bits wide. | |||
=== See Also === | === See Also === | ||
* [[PHY]] | * [[PHY]] | ||
* [[PHA]] | |||
* [[PLX]] | * [[PLX]] | ||
* [[STX]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/481 page 481] on PHX | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n175 page 165] on PHX | ||
* snes9x implementation of PHX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1878 | * snes9x implementation of PHX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1878 | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c02 additions]] | [[Category:65c02 additions]] | ||
[[Category:Push Instructions]] | |||
[[Category:One-byte Instructions]] | |||
[[Category:Three-cycle Instructions]] | |||
Latest revision as of 00:08, 17 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Push) | DA | 1 byte | 3 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
PHX is a 65c816 instruction that pushes the value of the X index register onto the stack. If X is 16 bits wide, the high byte is pushed first.
The stack pointer is decremented by the number of bytes X is.
No flags are affected.
Syntax
PHX
Cycle Penalty
- PHX takes one additional cycle if the index registers are 16 bits wide.
See Also
External Links
- Eyes & Lichty, page 481 on PHX
- Labiak, page 165 on PHX
- snes9x implementation of PHX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1878