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CMA

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  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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SBI

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Syntax: SBI 8bit  Where 8-bit is an immediate data operand.  Byte: 2byte Addressing Mode: Immediate   Addressing Working:  1.  2. A= A- 8bit -b 3.  4. Flag Example: SBI 10H where  [A]= 22H and [c flag]= 1 After execution of SBI   10H [A] = 11H  // A= A-8bit-b => 22-10-1 =11H Program: write an ALP for subtraction of 30H value from Registers A  Where A carries 44H and Cy flag carries borrow value 1. Store result at memory location 5000H. Label  Mnemonics  Comments Start:   SBI 30H        ;  a= a-8bit- cy...                                    ; A= 44- 30 -1 = 13h             STA 5000H   Stop: HLT Output: [5000H]= 13H      
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SUB

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Syntax: SUB 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: SUB B   where  [B] = 11H  and [A]= 22H After execution of  SUB  B [A] = 11H  [B] = 22H Program: write an ALP for 8bit subtraction  of values present in Registers A and B where A carries 44H and B carries 30H. Store result at memory location 5000H. Label  Mnemonics  Comments Start: SUB B            STA 5000H   Stop: HLT Output: [5000H]= 14H LXI H, 4000H ;  4000= 90h MOV A,M ; a = 90h INX H ;  4001h where 4001= 40h MOV B, M ; b= 4 0h SUB B ; a = a - b ... A = 90 - 40= 50h INX H ;  4002h MOV M,A ;  4002h = 50h HLT            
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