RAR

 

Syntax: RAR

 

Byte: 1byte

 

Addressing Mode: Implicit Addressing

Working: 

1. This is one byte instruction.

2. Microproccessor will allocate one byte for opcode RAR and operand is Accumulator i.e. operand will not need memory allocation during execution.

3. This instruction rotates content of Accumulator one bit position towards Right.  i.e. The bit A0 is stored  in carry flag and content of carry flag will get stored in A7 bit position.

 

4. C Flag will get affected.

Example: RAR

 

where  [A]= 21H

After execution of RAR

[A] = 90H

 

 

A= 21 =  0010 0001

A7 ->  A6 -> A5 -> A4 -> A3 -> A2 -> A1 -> A0   -> Cy 

 |___<-____________________________<-________|

 

0         0         1        0       0         0       0         1         1             .....(INITIAL BIT POSITIONS)

1         0         0        1       0         0       0        0           1

                                                                                                .....(RESULTANT BIT POSITIONS)

              9                                        0