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PHP: Difference between revisions
From SnesLab
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The [[stack pointer]] will then point directly below the byte pushed. | The [[stack pointer]] will then point directly below the byte pushed. | ||
No flags are affected. | No flags are affected according to Eyes & Lichty. | ||
But [[fullsnes]] claims that PHP always writes a one into the [[break flag]]. | |||
==== Syntax ==== | ==== Syntax ==== | ||
Revision as of 01:59, 22 July 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: https://archive.org/details/0893037893ProgrammingThe65816/page/480
- Labiak page 164 on PHP: https://archive.org/details/Programming_the_65816/page/n174
- MCS6500 Manual page 122 on PHP: https://archive.org/details/mos_microcomputers_programming_manual/page/n141
- Carr page 267 on PHP: https://archive.org/details/6502UsersManual/page/n280
- Leventhal page 3-82 on PHP: https://archive.org/details/6502-assembly-language-programming/page/n131
- snes9x implementation of PHP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1844