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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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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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MOV Instruction

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Syntax: MOV Rd,Rs Where Rs and Rd are general purpose registers (A,B,C,D,E,H andL) Byte: 1byte Addressing Mode: Register   Addressing Example: MOV A,B  where  [B] = 22H After execution of  MOV A,B [A] = 22H  [B] = 22H
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