Hi tushar.. Here I am giving u simple codes, Hope that it’ll b useful 2 u.
RD BIT P2.5
WR BIT P2.6
INTR BIT P2.7
MYDATA EQU P1
MOV P1,#0FFH
SETB INTR
BACK: CLR WR
SETB WR
HERE: JB INTR,HERE
CLR RD
MOV A,MYDATA
ACALL CONVERSION ; u have to make a conversion subroutine for hex to ascii conversion.
ACALL DISPLAY ; likewise … for display
SETB RD
SJMP BACK
Repl me whether it works or not.