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TXS: Difference between revisions
From SnesLab
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!colspan="9"|Flags Affected | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[Decimal Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
|. | |. | ||
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'''TXS''' (Transfer X to Stack Pointer) is a 65x instruction that transfers the value of the [[X index register]] to the [[stack pointer]]. | '''TXS''' (Transfer X to Stack Pointer) is a 65x instruction that transfers the value of the [[X index register]] to the [[stack pointer]]. | ||
* If X is 16 bits wide then all 16 bits are transferred. | |||
* If X is 8 bits wide but the stack pointer is 16 bits wide then X is transferred to the low byte and the high byte of the stack pointer is cleared. | |||
* If both X and the stack pointer are 8 bits wide (aka [[emulation mode]]) then 8 bits are transferred | |||
No flags are affected. | |||
==== Syntax ==== | |||
<pre> | |||
TXS | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[TSX]] | |||
* [[TCS]] | * [[TCS]] | ||
* [[TXA]] | * [[TXA]] | ||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/518 page 518] on TXS | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n209 page 199] on TXS | ||
* [[MCS6500 Manual]] | * 8.8 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n139 page 120] on TXS | ||
* [[Carr]] | * [[Carr]], [https://archive.org/details/6502UsersManual/page/n290 page 277] on TXS | ||
* [[Leventhal]] | * [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n152 page 3-103] on TXS | ||
* snes9x implementation of TXS: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2415 | * snes9x implementation of TXS: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2415 | ||
[[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 21:07, 7 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | 9A | 1 byte | 2 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
TXS (Transfer X to Stack Pointer) is a 65x instruction that transfers the value of the X index register to the stack pointer.
- If X is 16 bits wide then all 16 bits are transferred.
- If X is 8 bits wide but the stack pointer is 16 bits wide then X is transferred to the low byte and the high byte of the stack pointer is cleared.
- If both X and the stack pointer are 8 bits wide (aka emulation mode) then 8 bits are transferred
No flags are affected.
Syntax
TXS
See Also
External Links
- Eyes & Lichty, page 518 on TXS
- Labiak, page 199 on TXS
- 8.8 on MCS6500 Manual, page 120 on TXS
- Carr, page 277 on TXS
- Leventhal, page 3-103 on TXS
- snes9x implementation of TXS: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2415