See if this Algorithm Helps..

1. start
2. R0 <- 0
3. if P2.0 = 1 then goto 4 else goto 7
4. if R0 = 9 then goto 5 else goto 6
5. Data Achieved. Goto 10
6. Data Not Achieved. Goto 10
7. if R0 = 9 then goto 7 else goto 8
8. R0 <- R0 + 1
9. Goto 3
10. Stop

It will check if the first 8 bits are 0's and the 9th bit is 1. Implement it at suitable location in your program.

-Harsha.