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Stack Relative Indirect Indexed, Y Addressing: Difference between revisions
From SnesLab
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* [[AND]] (opcode 33) | * [[AND]] (opcode 33) | ||
* [[CMP]] (opcode D3) | * [[CMP]] (opcode D3) | ||
* [[EOR]] | * [[EOR]] (opcode 53) | ||
* [[LDA]] (opcode B3) | * [[LDA]] (opcode B3) | ||
* [[ORA]] (opcode 13) | * [[ORA]] (opcode 13) | ||
* [[SBC]] (opcode F3) | * [[SBC]] (opcode F3) | ||
* [[STA]] (opcode 93) | * [[STA]] (opcode 93) | ||
They are all two bytes long. | |||
The '''indirect address''' lives on the [[stack]] at sum of the [[stack pointer]] and the 8-bit operand. | |||
The '''effective address''' is generated by concatenating the [[data bank register]] to the indirect address, and then adding the [[Y index register]] to the 24-bit sum. | |||
==== Syntax ==== | |||
<pre> | |||
LDA (sr, S), Y | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[Stack Addressing]] | |||
* [[Stack Relative Addressing]] | * [[Stack Relative Addressing]] | ||
=== | === References === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/419 page 419] | ||
* section 3.5.24 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf | |||
* Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.21 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Addressing Modes]] | [[Category:Addressing Modes]] | ||
[[Category:Complex Admodes]] | |||
[[Category:65c816 additions]] | |||
Latest revision as of 18:27, 8 August 2024
Stack Relative Indirect Indexed, Y Addressing is supported by eight instructions:
- ADC (opcode 73)
- AND (opcode 33)
- CMP (opcode D3)
- EOR (opcode 53)
- LDA (opcode B3)
- ORA (opcode 13)
- SBC (opcode F3)
- STA (opcode 93)
They are all two bytes long.
The indirect address lives on the stack at sum of the stack pointer and the 8-bit operand.
The effective address is generated by concatenating the data bank register to the indirect address, and then adding the Y index register to the 24-bit sum.
Syntax
LDA (sr, S), Y
See Also
References
- Eyes & Lichty, page 419
- section 3.5.24 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.21