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DEC

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Basic Info
Addressing Mode Opcode Length Speed
accumulator 3A 1 byte 2 cycles*
absolute CE 3 bytes 6 cycles*
direct page C6 2 bytes 5 cycles*
absolute indexed X DE 3 bytes 7 cycles*
direct page indexed X D6 2 bytes 6 cycles*
Flags Affected
N V M X D I Z C
. . . . . .

DEC (Decrement) is a 65x instruction that decrements the value in the location specified by the operand. Except in accumulator addressing, DEC takes two extra cycles when the accumulator is 16 bits wide.

See Also

External Links