Stack Relative Indirect Indexed, Y Addressing: Difference between revisions

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

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

@@ Line 9: / Line 9: @@
 * [[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 ====
+<pre>
+LDA (sr, S), Y
+</pre>
 === See Also ===
+* [[Stack Addressing]]
 * [[Stack Relative Addressing]]
-=== Reference ===
+=== References ===
-* [[Eyes & Lichty]] page 419, https://archive.org/details/0893037893ProgrammingThe65816/page/n445
+* [[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:Addressing Modes]]
+[[Category:Complex Admodes]]
 [[Category:65c816 additions]]