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AND
From SnesLab
Basic Info | |||||||
---|---|---|---|---|---|---|---|
Addressing Mode | Opcode | Length | Speed | ||||
Immediate | 29 | 2 bytes | 2 cycles* | ||||
Absolute | 2D | 3 bytes | 4 cycles* | ||||
Absolute Long | 2F | 4 bytes | 5 cycles* | ||||
Direct Page | 25 | 2 bytes | 3 cycles* | ||||
Direct Page Indirect | 32 | 2 bytes | 5 cycles* | ||||
Direct Page Indirect Long | 27 | 2 bytes | 6 cycles* | ||||
absolute indexed by X | 3D | 3 bytes | 4 cycles* | ||||
absolute long indexed by X | 3F | 4 bytes | 5 cycles* | ||||
absolute indexed by Y | 39 | 3 bytes | 4 cycles* | ||||
direct page indexed by X | 35 | 2 bytes | 4 cycles* | ||||
direct page indirect indexed by X | 21 | 2 bytes | 6 cycles* | ||||
direct page indirect indexed by Y | 31 | 2 bytes | 5 cycles* | ||||
direct page indirect long indexed by Y | 37 | 2 bytes | 6 cycles* | ||||
Stack Relative | 23 | 2 bytes | 4 cycles* | ||||
stack relative indirect indexed by Y | 33 | 2 bytes | 7 cycles* |
Flags Affected | |||||||
---|---|---|---|---|---|---|---|
N | V | M | X | D | I | Z | C |
. | . | . | . | . | . |
AND is a 65x instruction that performs a logical AND.
Cycle Penalties
- In all addressing modes, AND takes one extra cycle when the accumulator is 16 bits wide.
- In direct page addressing modes only, AND takes an extra cycle if the low byte of the direct page register is nonzero.
- In both Absolute Indexed addressing modes and DP Indirect Indexed by Y admodes, AND takes an extra cycle if adding the index crosses a page boundary.
See Also
External Links
- Eyes & Lichty page on AND: https://archive.org/details/0893037893ProgrammingThe65816/page/n451
- Labiak page on AND: https://archive.org/details/Programming_the_65816/page/n125
- MCS6500 Manual page on AND: https://archive.org/details/mos_microcomputers_programming_manual/page/n35
- Carr page on AND: https://archive.org/details/6502UsersManual/page/n259
- Leventhal page on AND: https://archive.org/details/6502-assembly-language-programming/page/n87
- undisbeliever on AND: https://undisbeliever.net/snesdev/65816-opcodes.html#and-and-accumulator-with-memory