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DESCRIPTION OF INSTRUCTIONS
281
31. DEC A (Decrement accumulator)
00010100
70
Instruction code
Operation
Number of bytes
Number of cycles
Flags
(PSW)
Description
Example DEC A
Instruction code
: Byte 1
(A)←(A)–1:
C AC F0 RS1 RS0 OV F1 P
•
:
:
:
The accumulator contents are decremented by 1, and the flag is
updated.
:
00010100
70
Byte 1
Accumulator
10101000
70
1
1
Before execution
Accumulator
10100111
70
After execution
: