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EOR: Difference between revisions

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'''EOR''' is a 65x instruction that performs an [https://mathworld.wolfram.com/XOR.html exclusive or].  In all [[addressing modes]], EOR takes one extra cycle when the accumulator is 16 bits wide.  In [[direct page addressing]] modes, EOR takes one additional cycle if the low byte of the [[direct page register]] is nonzero.  
'''EOR''' is a 65x instruction that performs an [https://mathworld.wolfram.com/XOR.html exclusive or].  In all [[addressing modes]], EOR takes one extra cycle when the accumulator is 16 bits wide.  In [[direct page addressing]] modes, EOR takes one additional cycle if the low byte of the [[direct page register]] is nonzero.  In both [[Absolute Indexed]] and DP Indirect Indexed, Y admodes, EOR takes an extra cycle if adding the index crosses a page boundary.


=== See Also ===
=== See Also ===

Revision as of 02:40, 20 November 2023

Basic Info
Addressing Mode Opcode Length Speed
immediate 49 2 bytes 2 cycles*
absolute 4D 3 bytes 4 cycles*
absolute long 4F 4 bytes 5 cycles*
direct page 45 2 bytes 3 cycles*
direct page indirect 52 2 bytes 5 cycles*
direct page indirect long 47 2 bytes 6 cycles*
absolute indexed by X 5D 3 bytes 4 cycles*
absolute long indexed by X 5F 4 bytes 5 cycles*
absolute indexed by Y 59 3 bytes 4 cycles*
direct page indexed by X 55 2 bytes 4 cycles*
direct page indexed indirect by X 41 2 bytes 6 cycles*
direct page indirect indexed by Y 51 2 bytes 5 cycles*
direct page indirect long indexed by Y 57 2 bytes 6 cycles*
stack relative 43 2 bytes 4 cycles*
stack relative indirect indexed by Y 53 2 bytes 7 cycles*
Flags Affected
N V M X D I Z C
. . . . . .

EOR is a 65x instruction that performs an exclusive or. In all addressing modes, EOR takes one extra cycle when the accumulator is 16 bits wide. In direct page addressing modes, EOR takes one additional cycle if the low byte of the direct page register is nonzero. In both Absolute Indexed and DP Indirect Indexed, Y admodes, EOR takes an extra cycle if adding the index crosses a page boundary.

See Also

External Links

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