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PHA: Difference between revisions
From SnesLab
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'''PHA''' (PusH Accumulator) is a 65x instruction that pushes the value in the [[accumulator]] to the [[stack]]. If the accumulator is 16 bits wide, the high byte is pushed first. The [[stack pointer]] is decremented. | '''PHA''' (PusH Accumulator) is a 65x instruction that pushes the value in the [[accumulator]] to the [[stack]]. If the accumulator is 16 bits wide, the high byte is pushed first. The [[stack pointer]] is decremented. | ||
No flags are affected. | |||
===== Cycle Penalty ===== | ===== Cycle Penalty ===== | ||
Revision as of 22:31, 27 June 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Push) | 48 | 1 byte | 3 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
PHA (PusH Accumulator) is a 65x instruction that pushes the value in the accumulator to the stack. If the accumulator is 16 bits wide, the high byte is pushed first. The stack pointer is decremented.
No flags are affected.
Cycle Penalty
- PHA takes one extra cycle if the accumulator is 16 bits wide.
See Also
External Links
- Eyes & Lichty page 476, on PHA: https://archive.org/details/0893037893ProgrammingThe65816/page/n502
- Labiak page 160 on PHA: https://archive.org/details/Programming_the_65816/page/n170
- MCS6500 Manual page 117 on PHA: https://archive.org/details/mos_microcomputers_programming_manual/page/n136
- Carr page 267 on PHA: https://archive.org/details/6502UsersManual/page/n280
- Leventhal page 3-81 on PHA: https://archive.org/details/6502-assembly-language-programming/page/n130