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
SUI
Syntax: SUI 8-bit Where 8-bit is an immediate data operand. Byte: 2byte Addressing Mode: Immediate Addressing Working: 1. 2. 3. 4. Flag Example: SUI 11H where [A]= 22H After execution of SUI 11H [A] = 11H Program: write an ALP for 8bit subtraction of value present in Register A that is 44H with an immediate value 30H. Store result at memory location 5000H. Label Mnemonics Comments Start: SUI 30H STA 5000H Stop: HLT Output: [5000H]= 14H
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