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
LDAX
Syntax: LDAX Rhp Where Rhp is higher order register the pair. (HL, BC or DE) Byte: 1byte Addressing Mode: Register Indirect Addressing Working: for execution of this instruction, microprocessor will allocate first byte for opcode and the operand is register which don't need allocation. Example: LDAX B where [C]= 50H [B] = 20 H [2050H]= 88H After execution of LDAX B [A]= 88 H
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