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TYA: Difference between revisions
From SnesLab
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Implied]] (type 1) | ||
|98 | |98 | ||
|1 byte | |1 byte | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="8"|Flags | !colspan="8"|Flags Affected | ||
|+ | |||
|[[Negative Flag|N]] | |||
|[[Overflow Flag|V]] | |||
|[[M Flag|M]] | |||
|[[X Flag|X]] | |||
|[[Decimal Flag|D]] | |||
|[[I Flag|I]] | |||
|[[Zero Flag|Z]] | |||
|[[Carry Flag|C]] | |||
|+ | |+ | ||
|N | |N | ||
|. | |. | ||
|. | |. | ||
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|. | |. | ||
|. | |. | ||
| | |Z | ||
|. | |. | ||
|} | |} | ||
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|16 bits are transferred | |16 bits are transferred | ||
|} | |} | ||
==== Syntax ==== | |||
<pre> | |||
TYA | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[TXA]] | * [[TXA]] | ||
* [[TAY]] | * [[TAY]] | ||
* [[TYX]] | |||
* [[STY]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/520 page 520] on TYA | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n211 page 201] on TYA | ||
* [[MCS6500 Manual]] | * 7.14 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n119 page 101] on TYA | ||
* [[Carr]] | * [[Carr]], [https://archive.org/details/6502UsersManual/page/n288 page 275] on TYA | ||
* [[Leventhal]] | * [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n153 page 3-104] on TYA | ||
* snes9x implementation of TYA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2455 | * snes9x implementation of TYA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2455 | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
[[Category:Transfer Instructions]] | |||
[[Category:One-byte Instructions]] | |||
[[Category:Implied Instructions]] | |||
[[Category:Two-cycle Instructions]] | |||
Latest revision as of 02:55, 8 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | 98 | 1 byte | 2 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| N | . | . | . | . | . | Z | . |
TYA is a 65x instruction that transfers the value of the Y index register to the accumulator.
| Instruction Behavior | ||
|---|---|---|
| 8-bit accumulator (m=1) | 16-bit accumulator (m=0) | |
| 8-bit index registers (x=1) | 8 bits are transferred | 8 bits are transferred to the low byte of accumulator and high byte of the accumulator is zeroed |
| 16-bit index registers (x=0) | 8 bits (the low byte of the index register) are transferred and the hidden byte of the B accumulator is unaffected | 16 bits are transferred |
Syntax
TYA
See Also
External Links
- Eyes & Lichty, page 520 on TYA
- Labiak, page 201 on TYA
- 7.14 on MCS6500 Manual, page 101 on TYA
- Carr, page 275 on TYA
- Leventhal, page 3-104 on TYA
- snes9x implementation of TYA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2455