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PHA: Difference between revisions
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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. | '''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. | ||
===== Cycle Penalty ===== | ===== Cycle Penalty ===== | ||
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[[Category:Push Instructions]] | [[Category:Push Instructions]] | ||
[[Category:One-byte Instructions]] | [[Category:One-byte Instructions]] | ||
[[Category:Three-cycle Instructions]] | |||
Latest revision as of 12:32, 14 December 2023
| 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.
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