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PHY: Difference between revisions
From SnesLab
(high byte first) |
(no flags affected) |
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'''PHY''' is a [[65c816]] instruction that pushes the value of the [[Y index register]] onto the [[stack]]. If Y is 16 bits wide, the high byte is pushed first. | '''PHY''' is a [[65c816]] instruction that pushes the value of the [[Y index register]] onto the [[stack]]. If Y is 16 bits wide, the high byte is pushed first. | ||
No flags are affected. | |||
===== Cycle Penalty ===== | ===== Cycle Penalty ===== | ||
Revision as of 22:33, 27 June 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Push) | 5A | 1 byte | 3 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
PHY is a 65c816 instruction that pushes the value of the Y index register onto the stack. If Y is 16 bits wide, the high byte is pushed first.
No flags are affected.
Cycle Penalty
- PHY takes one additional cycle if the index registers are 16 bits wide.
See Also
External Links
- Eyes & Lichty page 482, on PHY: https://archive.org/details/0893037893ProgrammingThe65816/page/n508
- Labiak page 166 on PHY: https://archive.org/details/Programming_the_65816/page/n176
- snes9x implementation of PHY: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1921