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Accumulator Addressing: Difference between revisions

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(note about XBA)
(one byte long)
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* [[ROR]] (opcode 6A)
* [[ROR]] (opcode 6A)


In this admode, the [[accumulator]] is the operand.<sup>[3]</sup>
In this admode, the [[accumulator]] is the operand.<sup>[3]</sup> They all are one byte long.


==== Syntax ====
==== Syntax ====

Revision as of 15:09, 22 July 2024

There are six instructions that support Accumulator Addressing on the 65c816. They are:

  • ASL (opcode 0A)
  • DEC (opcode 3A)
  • INC (opcode 1A)
  • LSR (opcode 4A)
  • ROL (opcode 2A)
  • ROR (opcode 6A)

In this admode, the accumulator is the operand.[3] They all are one byte long.

Syntax

ROR
RORA
ROR A

Interestingly, XBA is not considered to use accumulator addressing.

See Also

Reference

  1. Eyes & Lichty, page 387: https://archive.org/details/0893037893ProgrammingThe65816/page/387
  2. page 126, lbid: https://archive.org/details/0893037893ProgrammingThe65816/page/n152
  3. section 3.5.8 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf
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