RLC

 

 

Syntax: RLC 

 

Byte: 1byte

 

Addressing Mode: Implicit Addressing

Working: 

1. This is one byte instruction.

2. Microproccessor will allocate one byte for opcode RLC 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 bit position A0  as well as in carry flag.

4. C flag will get affected.

Example: RLC

 

where  [A]= 21H

After execution of RLC

[A] =42H

 

 

A= 21 =  0010 0001

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

              |___->__________________________->_|

 

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

0          0          1         0        0       0         0       1         0       

                                                                                                .....(RESULTANT BIT POSITIONS)

                           4                                        2