program to check given 8-bit data is "2 out of 5 code" or not

Before we write the program to check whether the given 8-bit data is "2 out of 5 code" or not, let us first understand what is meant by 2 out of 5 code. An 8-bit is 2 out of 5 code if and oly if its 3 MSB bits are zero and the remaining 5 bits contains two 1's. You will be able to understand clearly from the following example shown below.


 let us take the 8 bit data as 18

18 = 0001 1000
         1      8

so in the above example the 3 MSB bits(i.e first 3 bits) are zero & there are two 1's in remaing 5 bits. so that makes the given 8-bit 2 out of 5 code.


Program :
// If given 8 bit is 2 out of 5 code store FFH in memory location 30H//
//If no, store 00H in memory location 30H//


        ORG 00H
        SJMP START
        RESULT EQU 30H
START : MOV A,#_H
        MOV B,A
        ANL A,#0E0H
        JNZ EXIT
        MOV A,B
        MOV R0,#05H
        MOV R1,#00H
   UP : RRC A
        JNC DOWN
        INC R1
 DOWN : DJNZ R0,UP
        MOV A,R1
        CJNE A,#02H,EXIT
        MOV RESULT,#0FFH
        SJMP STOP
 EXIT : MOV RESULT,#00H
 STOP : SJMP STOP
        END