Use of CJNE and LJMP or SJMP instruction in micro controller

Written By :-Blogger Aman Yadav 
CJNE:- Compare and jump if not equal(CY Flag)

Program to use of this instruction by comparing two value

             Program                                     Description

             mov       R1,#80h                   ;load the 80 hexadecimal code in R1 register

  Here:  mov       A,R1                         ;move value of R1 in Accumulator (Here is a label)

            CJNE     A,#50 , Here             ;Compare accumulator value with 50 , if equal than

                                                              execute next instruction otherwise jump to Here label

LJMP:- Long jump
SJMP:- Short jump
These two instructions are used to short and long jump on any subroutine program.here is a program in which a received value is comes into SBUF (instruction)  which is move continuously into Accumulator
and check with a register value if these value is same than jump on a subroutine program by using LJMP or SJMP instruction
 
     Assembly Program for receiving data into sbuf and compare and jump to a sub routine program if value are equal :-      

                Program                                     Description

                org0000h

                mov       R0,#67h                       ;load the 67 in R0 register

                mov       A,SBUF                       ;copy the value from Sbuf to A

      Here: CJNE   A,R0,Here      ;compare and jump if not equal , if equal execute next instruction         

                Sjmp      Here2                           ;short jump on any subroutine program

                 ----- ----  ---- 

                  ----- ------ ----- 

                    ----- -----  -----

      Here2: write here a subroutine program 

 
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