We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
XBA: Difference between revisions
From SnesLab
(type 1 admode) |
(3 cycle Instructions) |
||
| (8 intermediate revisions by the same user not shown) | |||
| Line 7: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Implied]] (type 1) | ||
|EB | |EB | ||
|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 35: | Line 35: | ||
|} | |} | ||
'''XBA''' is an instruction that exchanges the high byte (B) and low byte (typically called A) of the [[C accumulator]]. It works even in [[6502 emulation mode]]. In [[65816 native mode]], its mnemonic is still "XBA" even when the accumulator is 16-bits wide. | '''XBA''' is an instruction that exchanges the high byte (B) and low byte (typically called A) of the [[C accumulator]]. It works even in [[6502 emulation mode]]. In [[65816 native mode]], its standard mnemonic is still "XBA" even when the accumulator is 16-bits wide. An alternative mnemonic is "SWA." | ||
=== See Also === | === See Also === | ||
| Line 43: | Line 43: | ||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on XBA: https://archive.org/details/0893037893ProgrammingThe65816/page/n550 | * [[Eyes & Lichty]] page 524, on XBA: https://archive.org/details/0893037893ProgrammingThe65816/page/n550 | ||
* [[Labiak]] page on XBA: https://archive.org/details/Programming_the_65816/page/n214 | * [[Labiak]] page 204 on XBA: https://archive.org/details/Programming_the_65816/page/n214 | ||
* snes9x implementation of XBA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3261 | * snes9x implementation of XBA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3261 | ||
* undisbeliever on XBA: https://undisbeliever.net/snesdev/65816-opcodes.html#xba-exchange-the-b-and-a-accumulators | * undisbeliever on XBA: https://undisbeliever.net/snesdev/65816-opcodes.html#xba-exchange-the-b-and-a-accumulators | ||
| Line 50: | Line 50: | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c816 additions]] | [[Category:65c816 additions]] | ||
[[Category:Exchange Instructions]] | |||
[[Category:One-byte Instructions]] | |||
[[Category:Implied Instructions]] | |||
[[Category:Three-cycle Instructions]] | |||
Latest revision as of 11:53, 14 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | EB | 1 byte | 3 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| . | . | . | . | . | . | ||
XBA is an instruction that exchanges the high byte (B) and low byte (typically called A) of the C accumulator. It works even in 6502 emulation mode. In 65816 native mode, its standard mnemonic is still "XBA" even when the accumulator is 16-bits wide. An alternative mnemonic is "SWA."
See Also
External Links
- Eyes & Lichty page 524, on XBA: https://archive.org/details/0893037893ProgrammingThe65816/page/n550
- Labiak page 204 on XBA: https://archive.org/details/Programming_the_65816/page/n214
- snes9x implementation of XBA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3261
- undisbeliever on XBA: https://undisbeliever.net/snesdev/65816-opcodes.html#xba-exchange-the-b-and-a-accumulators