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PHP: Difference between revisions
From SnesLab
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Stack Addressing|Stack]] (Push) | ||
|08 | |08 | ||
|1 byte | |1 byte | ||
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{| 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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'''PHP''' is a 65x instruction that pushes the value of the [[processor status register]] onto the stack. | '''PHP''' is a 65x instruction that pushes the value of the [[processor status register]] onto the [[stack]]. The [[e bit]] is omitted from this operation. PHP always pushes a single byte. | ||
The [[stack pointer]] will then point directly below the byte pushed. | |||
No flags are affected according to Eyes & Lichty. | |||
But [[fullsnes]] claims that PHP always writes a one into the [[break flag]]. | |||
==== Syntax ==== | |||
<pre> | |||
PHP | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[PLP]] | |||
* [[PHA]] | * [[PHA]] | ||
* [[PHX]] | * [[PHX]] | ||
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=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/480 page 480] on PHP | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n174 page 164] on PHP | ||
* [[MCS6500 Manual]] | * 8.11 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n141 page 122] on PHP | ||
* [[Carr]] | * [[Carr]], [https://archive.org/details/6502UsersManual/page/n280 page 267] on PHP | ||
* [[Leventhal]] | * [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n131 page 3-82] on PHP | ||
* snes9x implementation of PHP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1844 | * snes9x implementation of PHP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1844 | ||
* Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.3 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
[[Category:Push Instructions]] | |||
[[Category:One-byte Instructions]] | |||
Latest revision as of 14:20, 8 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Push) | 08 | 1 byte | 3 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | .? | . | . | . | . | |
PHP is a 65x instruction that pushes the value of the processor status register onto the stack. The e bit is omitted from this operation. PHP always pushes a single byte.
The stack pointer will then point directly below the byte pushed.
No flags are affected according to Eyes & Lichty. But fullsnes claims that PHP always writes a one into the break flag.
Syntax
PHP
See Also
External Links
- Eyes & Lichty, page 480 on PHP
- Labiak, page 164 on PHP
- 8.11 on MCS6500 Manual, page 122 on PHP
- Carr, page 267 on PHP
- Leventhal, page 3-82 on PHP
- snes9x implementation of PHP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1844
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.3