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Stack Relative Addressing: Difference between revisions

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Supported by:
'''Stack Relative Addressing''' is supported by eight instructions:
* [[ADC]]
* [[AND]]
* [[CMP]]
* [[EOR]]
* [[LDA]]
* [[ORA]]
* [[SBC]]
* [[STA]]


=== Reference ===
* [[ADC]] (opcode 63)
* [[Eyes & Lichty]] page 418, https://archive.org/details/0893037893ProgrammingThe65816/page/n444
* [[AND]] (opcode 23)
* [[CMP]] (opcode C3)
* [[EOR]] (opcode 43)
* [[LDA]] (opcode A3)
* [[ORA]] (opcode 03)
* [[SBC]] (opcode E3)
* [[STA]] (opcode 83)
 
They are all two bytes long.
The effective addresses generated by stack relative addressing will always be in [[bank]] 0.<sup>[3]</sup>  The effective address is the sum of the [[stack pointer]] and the 8-bit operand byte.
 
==== Syntax ====
<pre>
LDA sr, S
</pre>
 
There is no long version of this addressing mode.
 
=== See Also ===
* [[Stack Addressing]]
* [[Stack Relative Indirect Indexed, Y Addressing]]
 
=== References ===
# [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/418 page 418]
# section 3.5.23 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf
# lbid, section 3.2
# Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.20
 
[[Category:Addressing Modes]]
[[Category:65c816 additions]]
[[Category:Complex Admodes]]
[[Category:ASM]]

Latest revision as of 17:39, 8 August 2024

Stack Relative Addressing is supported by eight instructions:

  • ADC (opcode 63)
  • AND (opcode 23)
  • CMP (opcode C3)
  • EOR (opcode 43)
  • LDA (opcode A3)
  • ORA (opcode 03)
  • SBC (opcode E3)
  • STA (opcode 83)

They are all two bytes long. The effective addresses generated by stack relative addressing will always be in bank 0.[3] The effective address is the sum of the stack pointer and the 8-bit operand byte.

Syntax

LDA sr, S

There is no long version of this addressing mode.

See Also

References

  1. Eyes & Lichty, page 418
  2. section 3.5.23 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf
  3. lbid, section 3.2
  4. Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.20