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DEC (SPC700)

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Basic Info
Addressing Mode Opcode Length Speed
Accumulator 9C 1 byte 2 cycles
Direct Page 8B 2 bytes 4 cycles
Direct Page Indexed by X 9B 2 bytes 5 cycles
Absolute 8C 3 bytes 5 cycles
Implied (type 1) 1D 1 byte 2 cycles
Implied (type 1) DC 1 byte 2 cycles
Flags Affected
N V P B H I Z C
N . . . . . Z .

DEC is an SPC700 instruction that decrements its operand by one.

Syntax

DEC A
DEC dp
DEC dp+X
DEC !abs
DEC X
DEC Y

The above are official, but some people prefer alternate mnemonics like:

DEA
DEX
DEY

See Also

External Links