A Visual Basic Application is sending to my PIC circuit a string 'a'.
How can I recognize letter 'a' is being received by my PIC 16F873A??

Can my PIC read strings or identify this "a" in another way?

I need to know whether I'm receiving an "a" because if this is so, I
must enable an interruption.

Many thanks in advace for your help and support.

Carolina.
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