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TCD: Difference between revisions
From SnesLab
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!colspan="8"|Flags Affected | !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]] | ||
|+ | |+ | ||
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'''TCD''' (Transfer aCcumulator to Direct page register) is a [[65c816]] instruction that transfers the value of the 16-bit [[accumulator]] to the [[direct page register]]. An alternate mnemonic is "TAD." | '''TCD''' (Transfer aCcumulator to Direct page register) is a [[65c816]] instruction that transfers the value of the 16-bit [[accumulator]] to the [[direct page register]]. An alternate mnemonic is "TAD." | ||
TCD ignores the M flag. If the accumulator is only 8 bits wide, the transfer still happens as if it were 16 bits wide. | |||
TCD works even in [[6502 emulation mode]]. | |||
=== See Also === | === See Also === | ||
* [[TDC]] | * [[TDC]] | ||
* [[PHD]] | |||
* [[PLD]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on TCD: https://archive.org/details/0893037893ProgrammingThe65816/page/n536 | * [[Eyes & Lichty]] page 510 on TCD: https://archive.org/details/0893037893ProgrammingThe65816/page/n536 | ||
* [[Labiak]] page on TCD: https://archive.org/details/Programming_the_65816/page/n201 | * [[Labiak]] page 191 on TCD: https://archive.org/details/Programming_the_65816/page/n201 | ||
* snes9x implementation of TCD: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2320 | * snes9x implementation of TCD: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2320 | ||
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[[Category:65c816 additions]] | [[Category:65c816 additions]] | ||
[[Category:Transfer Instructions]] | [[Category:Transfer Instructions]] | ||
[[Category:One-byte Instructions]] | |||
[[Category:Implied Instructions]] | |||
[[Category:Two-cycle Instructions]] | |||
Latest revision as of 02:57, 19 December 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | 5B | 1 byte | 2 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| . | . | . | . | . | . | ||
TCD (Transfer aCcumulator to Direct page register) is a 65c816 instruction that transfers the value of the 16-bit accumulator to the direct page register. An alternate mnemonic is "TAD."
TCD ignores the M flag. If the accumulator is only 8 bits wide, the transfer still happens as if it were 16 bits wide.
TCD works even in 6502 emulation mode.
See Also
External Links
- Eyes & Lichty page 510 on TCD: https://archive.org/details/0893037893ProgrammingThe65816/page/n536
- Labiak page 191 on TCD: https://archive.org/details/Programming_the_65816/page/n201
- snes9x implementation of TCD: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2320