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XCE: Difference between revisions
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Implied]] (type 2) | ||
|FB | |FB | ||
|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="9"|Flags | !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]] | ||
|E | |[[Emulation Mode Flag|E]] | ||
|+ | |+ | ||
|. | |. | ||
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|} | |} | ||
'''XCE''' is an instruction that exchanges the [[carry]] and [[emulation]] bits. It typically appears soon after the [[Reset Vector]] following a [[CLC]], to switch the [[S-CPU]] into [[65c816 native mode]]. | '''XCE''' is an instruction that exchanges the [[carry]] and [[Emulation Mode Flag|emulation]] bits. It typically appears soon after the [[Reset Vector]] following a [[CLC]], to switch the [[S-CPU]] into [[65c816 native mode]]. | ||
=== See Also === | === See Also === | ||
* [[XBA]] | * [[XBA]] | ||
* [[XCN]] | * [[XCN]] | ||
* [[SWAP]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on XCE: https://archive.org/details/0893037893ProgrammingThe65816/page/n551 | * [[Eyes & Lichty]] page 525, on XCE: https://archive.org/details/0893037893ProgrammingThe65816/page/n551 | ||
* [[Labiak]] page on XCE: https://archive.org/details/Programming_the_65816/page/n215 | * [[Labiak]] page 205 on XCE: https://archive.org/details/Programming_the_65816/page/n215 | ||
* snes9x implementation of XCE: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2517 | * snes9x implementation of XCE: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2517 | ||
* undisbeliever on XCE: https://undisbeliever.net/snesdev/65816-opcodes.html#xce-exchange-carry-and-emulation-bits | * undisbeliever on XCE: https://undisbeliever.net/snesdev/65816-opcodes.html#xce-exchange-carry-and-emulation-bits | ||
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[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c816 additions]] | [[Category:65c816 additions]] | ||
[[Category:Exchange Instructions]] | |||
[[Category:One-byte Instructions]] | |||
[[Category:Implied Instructions]] | |||
[[Category:Two-cycle Instructions]] | |||
Latest revision as of 11:52, 14 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 2) | FB | 1 byte | 2 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | E |
| . | . | . | . | . | ||||
XCE is an instruction that exchanges the carry and emulation bits. It typically appears soon after the Reset Vector following a CLC, to switch the S-CPU into 65c816 native mode.
See Also
External Links
- Eyes & Lichty page 525, on XCE: https://archive.org/details/0893037893ProgrammingThe65816/page/n551
- Labiak page 205 on XCE: https://archive.org/details/Programming_the_65816/page/n215
- snes9x implementation of XCE: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2517
- undisbeliever on XCE: https://undisbeliever.net/snesdev/65816-opcodes.html#xce-exchange-carry-and-emulation-bits