Hi Vignesh,

Before going further, IF YOU HAD MADE THIS POST FIRST IT WOULD HAVE MADE LOT EASIER FOR MEMBERS TO UNDERSTAND YOUR PROBLEMS AND SUGGEST ACCORDINGLY.

Both P0^1 == 1 and P0^1 & 0xF0 will XRL on P0.
code produced is

?C0003:
; while(P0^7==1) ;
MOV A,P0
JNZ ?C0003
?C0005:
; while( (P0^7 & 0xF0) == 1);
; SOURCE LINE # 63
MOV A,P0
XRL A,#01H
JZ ?C0005

If you want to check an individual input declare first using sbit as you have done in your first post and check on that like this

while (UP) { ;} // if UP input is high wait
code produced is
?C0001:
; while(UP) {;}
JB UP,?C0001

>>as Leo suggested, while((P0 &0xF0)==x). But not getting the required action. Am I missing something?

Now you can go through the sample code given in my earlier post and relate.