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DEC: Difference between revisions

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(clobbered -> affected)
(additional cycles)
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|3A
|3A
|1 byte
|1 byte
|2 cycles
|2 cycles*
|+
|+
|absolute
|absolute
|CE
|CE
|3 bytes
|3 bytes
|6 cycles
|6 cycles*
|+
|+
|direct page
|direct page
|C6
|C6
|2 bytes
|2 bytes
|5 cycles
|5 cycles*
|+
|+
|absolute indexed X
|absolute indexed X
|DE
|DE
|3 bytes
|3 bytes
|7 cycles
|7 cycles*
|+
|+
|direct page indexed X
|direct page indexed X
|D6
|D6
|2 bytes
|2 bytes
|6 cycles
|6 cycles*
|}
|}


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'''DEC''' (Decrement) is a 65x instruction that decrements the value in the location specified by the operand.
'''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 ===
=== See Also ===

Revision as of 00:12, 20 November 2023

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

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