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TCD: Difference between revisions
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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 === | ||
Line 48: | Line 54: | ||
[[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