RAL

 

Syntax: RAL

 

Byte: 1byte

 

Addressing Mode: Implicit Addressing

Working: 

1. This is one byte instruction.

2. Microproccessor will allocate one byte for opcode RAL 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 left.  i.e. The bit A7 is stored  in carry flag and content of carry flag will get stored in A0 bit position.

 

4. C Flag will get affected.

Example: RAL

 

where  [A]= 21H

After execution of RAL

[A] =43H

 

 

A= 21 =  0010 0001

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

  |___->____________________________->________|

 

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

0          0          1         0        0       0         0       1         1      

                                                                                                .....(RESULTANT BIT POSITIONS)

                           4                                        3