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TXS: Difference between revisions
From SnesLab
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(mention emulation mode) |
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* If X is 16 bits wide then all 16 bits are transferred. | * 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 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 then 8 bits are transferred | * If both X and the stack pointer are 8 bits wide (aka [[emulation mode]]) then 8 bits are transferred | ||
No flags are affected. | No flags are affected. | ||
Revision as of 22:51, 2 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: https://archive.org/details/0893037893ProgrammingThe65816/page/518
- Labiak page 199 on TXS: https://archive.org/details/Programming_the_65816/page/n209
- MCS6500 Manual page 120 on TXS: https://archive.org/details/mos_microcomputers_programming_manual/page/n139
- Carr page 277 on TXS: https://archive.org/details/6502UsersManual/page/n290
- Leventhal page 3-103 on TXS: https://archive.org/details/6502-assembly-language-programming/page/n152
- snes9x implementation of TXS: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2415