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CPX: Difference between revisions

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'''CPX''' (Compare X) is a 65x instruction that compares the value of the [[X index register]].  Internally, this is done via a subtraction, but the difference is not stored anywhere.  The contents at the effective address and the X index register both remain unchanged.
'''CPX''' (Compare X) is a 65x instruction that compares the value of the [[X index register]].  Internally, this is done via a subtraction, but the difference is not stored anywhere.  The contents at the effective address (when not using immediate data) and the X index register both remain unchanged.


CPX assumes its operands are unsigned.
CPX assumes its operands are unsigned.

Revision as of 09:04, 21 July 2024

Basic Info
Addressing Mode Opcode Length Speed
Immediate E0 2/3 bytes 2 cycles*
Absolute EC 3 bytes 4 cycles*
Direct Page E4 2 bytes 3 cycles*
Flags Affected
N V M X D I Z C
. . . . .

CPX (Compare X) is a 65x instruction that compares the value of the X index register. Internally, this is done via a subtraction, but the difference is not stored anywhere. The contents at the effective address (when not using immediate data) and the X index register both remain unchanged.

CPX assumes its operands are unsigned.

Syntax

CPX #const
CPX addr
CPX dp

See Also

External Links

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