Table of Contents Previous topic Next topic
MICROPROCESSOR INSTRUCTION REFERENCE->DECA
Decrement Accumulator A
Compatibility: 6800, 6802, 6803, 6303R, 6303X, 6303Y
A - 1 -> A
Condition Code Register
C Not affected
V Set if operand=%10000000 before execution, else cleared
Z Set if result zero, else cleared
N Set if result negative, else cleared
I Not affected
H Not affected
Addressing mode | op | cyc | bytes | Assembler syntax |
Implied: | 4A | 1 | 1 | DECA |