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There are a few options, easiest is to buy an RFID reader with UART connections (5volt level serial) such as the SMB130 module from sparkfun for 13.56MHz cards.
Connect UART data out pin to receive pin on 16F877a and data in pin to transmit pin on 16F877a. Write the software.
Seeedstudio has a similar module for 125KHz cards.
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