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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. | |||
=== See Also === | === See Also === | ||
Revision as of 10:53, 7 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.
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