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Immediate Addressing: Difference between revisions
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'''Immediate Addressing''' is when the data to be operated on directly follows the opcode in the instruction steam. The immediate data is generally preceded by a # in the assembler source. | '''Immediate Addressing''' is when the data to be operated on directly follows the opcode in the instruction steam. The immediate data is generally preceded by a # in the assembler source.<sup>[7]</sup> | ||
Supported by the following [[65c816]] instructions: | Supported by the following [[65c816]] instructions: | ||
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# section 3.5.18 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf | # section 3.5.18 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf | ||
# Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.14 | # Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.14 | ||
# [https://archive.org/details/mos_microcomputers_programming_manual/page/n205 B-2] | |||
[[Category:ASM]] | [[Category:ASM]] | ||
Revision as of 03:19, 9 August 2024
Immediate Addressing is when the data to be operated on directly follows the opcode in the instruction steam. The immediate data is generally preceded by a # in the assembler source.[7]
Supported by the following 65c816 instructions:
- ADC (opcode 69)
- SBC (opcode E9)
- EOR (opcode 49)
- AND (opcode 29)
- ORA (opcode 09)
- LDA (opcode A9)
- LDX (opcode A2)
- LDY (opcode A0)
- CMP (opcode C9)
- CPX (opcode E0)
- CPY (opcode C0)
- BIT (opcode 89)
- SEP (opcode E2)
- REP (opcode C2)
They are all either 2 or 3 bytes long.
The Super FX supports immediate addressing too:
On the SPC700, "imm" means "8-bit immediate data."[4] These commands support immediate data:
Syntax
LDA #const
See Also
References
- Eyes & Lichty, page 397
- lbid, page 108
- Labiak, page 209
- Appendix C-1 of Book I of the official Super Nintendo development manual
- section 3.5.18 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.14
- B-2