Help on 8051 programming

I am new to micro-p programming so pls help me in tis.

currently i am using a photo-reflective sensor i/p to my 8051 processor at p2.0.

for the sensor it will send a '0' if detect any reflected signal and '1' if didnt detect any signal.

so if the sensor always detect a '0' i will always increment my output data which is not wat i want.

what i need is when it detect '0' first and if next bit is still a '0' it will not output the data. Therefore, i need a program to keep track of the sensor. i need to output the data when there is a change in state from '1' to '0' only.

So hope that anyone can help me to write tis part of the program.

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