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ANI

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  Syntax: ANI 8-bit Where 8- bit is an immediate operand data. Byte: 2byte Addressing Mode: Immediate Addressing Working:  1.This is 2 byte instruction. 2. Microprocessor will allocate first byte for opcode and second byte for immediate data. 3. During execution of this instruction, microprocessor will perform Logical ANDing operation between content of Accumulator and Immediate data. 4. S, Z and  P  are modified . Cy is reset(Cy=0) and Ac is set (Ac=1) . Example: ANI 22H where [A]= 11H After execution of ANI 22H [A] = 00H     A= 11 =  0001 0001  =  22 =  0010 0010  A=00    0000  0000 FLAG=  01 0 1 0 0 0 0 = 50H
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SBB

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Syntax: SBB 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. A= A- R-b 3.  4. Flag Example: SBB D where  [D] = 10H , [A]= 22H and [c flag]= 1 After execution of SBB  B [A] = 11H  [D] = 10H // A= A-R-b => 22-10-1 =11H Program: write an ALP for subtraction of values present in Registers A ,B and C. Where A carries 44H and B carries 30H and C carries 10H. Store result at memory location 5000H. Label  Mnemonics  Comments Start: SUB B ;  a=a - b// 44-30= 14h            SBB  C ;  a= a - c - cy... A= 14-10-0 = 4h           STA 5000H   Stop: HLT Output: [5000H]= 04H      
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Register Indirect Addressing

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 EXAMPLES: CMP M ......... Register Indirect Addressing  MOV A, M MOV M, A ANA M ORA M XRA M SUB M  ADD M ADC M SBB M   LXI H 3000H  ; HL = 3000H MOV A,M       ; M = 10H ; M -> A INX H              ;  HL = 3001H CMP M             ; M = 11H,    IF [A] ? [M] ----- ----- [3000H] = 10 [3001H] = 11  
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