I suggest you start your project with downloading the datasheet for the 16F877A and read it. You dont have to understand more of the datasheet than to remember that you have seen something about this and that and then you look that section up.
Do you have a /P or /PT package? One is a 40-pin DIP, the other a 44-pin TQFP (surface mounted). Before we know this we dont know what pis it is :-)
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