We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
PHY: Difference between revisions
From SnesLab
(high byte first) |
|||
Line 35: | Line 35: | ||
|} | |} | ||
'''PHY''' is a [[65c816]] instruction that pushes the value of the [[Y index register]] onto the [[stack]]. | '''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. | ||
===== Cycle Penalty ===== | ===== Cycle Penalty ===== |
Revision as of 06:13, 7 December 2023
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.
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