We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
TXA: Difference between revisions
From SnesLab
(→See Also: TAX) |
(2 cycle Instructions) |
||
| (12 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
{| class="wikitable" style="float:right;clear:right;width: | {| class="wikitable" style="float:right;clear:right;width:40%" | ||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
|+ | |+ | ||
| Line 7: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Implied]] (type 1) | ||
|8A | |8A | ||
|1 byte | |1 byte | ||
| Line 14: | Line 14: | ||
{| 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 | ||
|+ | |+ | ||
|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]] | ||
|+ | |+ | ||
| | | | ||
| Line 58: | Line 58: | ||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on TXA: https://archive.org/details/0893037893ProgrammingThe65816/page/n543 | * [[Eyes & Lichty]] page 517, on TXA: https://archive.org/details/0893037893ProgrammingThe65816/page/n543 | ||
* [[Labiak]] page on TXA: https://archive.org/details/Programming_the_65816/page/n208 | * [[Labiak]] page 198 on TXA: https://archive.org/details/Programming_the_65816/page/n208 | ||
* [[MCS6500 Manual]] page on TXA: https://archive.org/details/mos_microcomputers_programming_manual/page/n118 | * [[MCS6500 Manual]] page 100 on TXA: https://archive.org/details/mos_microcomputers_programming_manual/page/n118 | ||
* [[Carr]] page on TXA: https://archive.org/details/6502UsersManual/page/n289 | * [[Carr]] page 276 on TXA: https://archive.org/details/6502UsersManual/page/n289 | ||
* [[Leventhal]] page on TXA: https://archive.org/details/6502-assembly-language-programming/page/n151 | * [[Leventhal]] page 3-102 on TXA: https://archive.org/details/6502-assembly-language-programming/page/n151 | ||
* snes9x implementation of TXA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2384 | * snes9x implementation of TXA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2384 | ||
[[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 11:58, 14 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | 8A | 1 byte | 2 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| . | . | . | . | . | . | ||
TXA is a 65x instruction that transfers the value of the X 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 are transferred | 16 bits are transferred |
See Also
External Links
- Eyes & Lichty page 517, on TXA: https://archive.org/details/0893037893ProgrammingThe65816/page/n543
- Labiak page 198 on TXA: https://archive.org/details/Programming_the_65816/page/n208
- MCS6500 Manual page 100 on TXA: https://archive.org/details/mos_microcomputers_programming_manual/page/n118
- Carr page 276 on TXA: https://archive.org/details/6502UsersManual/page/n289
- Leventhal page 3-102 on TXA: https://archive.org/details/6502-assembly-language-programming/page/n151
- snes9x implementation of TXA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2384