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Direct Page Addressing: Difference between revisions
From SnesLab
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* [[Direct Page Bit Addressing]] | * [[Direct Page Bit Addressing]] | ||
Revision as of 04:14, 16 July 2024
Direct Page Addressing is an addressing mode that is supported by the 65c816 and SPC700. The effective addresses generated by it are always in bank 0.[4]
The operand specifies which byte of the direct page to access.
Supported by 24 instructions on the '816:
- ADC (opcode 65)
- SBC (opcode E5)
- EOR (opcode 45)
- ASL (opcode 06)
- LSR (opcode 46)
- INC (opcode E6)
- DEC (opcode C6)
- BIT (opcode 24)
- CMP (opcode C5)
- CPX (opcode E4)
- CPY (opcode C4)
- ORA (opcode 05)
- AND (opcode 25)
- LDA (opcode A5)
- LDX (opcode A6)
- LDY (opcode A4)
- ROL (opcode 26)
- ROR (opcode 66)
- STA (opcode 85)
- STX (opcode 86)
- STY (opcode 84)
- STZ (opcode 64)
- TRB (opcode 14)
- TSB (opcode 04)
Syntax
LDA dp
See Also
- Zero Page Addressing
- Direct Page Indexed, X Addressing
- Direct Page Indexed, Y Addressing
- Direct Page Bit Addressing
References
- Eyes & Lichty, page 389: https://archive.org/details/0893037893ProgrammingThe65816/page/389
- lbid, page 114: https://archive.org/details/0893037893ProgrammingThe65816/page/n140
- section 3.5.17 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf
- lbid, section 3.3