DCR
Syntax: DCR R
Where R can be any of the general purpose registers (A,B,C,D,E,H andL)
Byte: 1byte
Addressing Mode: Register Addressing
Working:
1.
2.
3.
4. Flag
Example: DCR B
Where [B]= 10H
After execution of DCR B
[B]= 0F H
CMA
Syntax: CMA Byte: 1byte Addressing Mode: Implied Addressing Flag: None Working: 1. Microprocessor will allocate one byte for opcode. 2. During the execution of the instruction microprocessor will perform 1's complement on content of Accumulator. Example: CMA where [A] = 22H After execution of CMA [A] = DD H A= 22 H = 0010 0010 1's Complement of A = 1101 1101 = DD H
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