here i am sending you the link how to interrupt in 8051
http://www.engineersgarage.com/tutorials/interrupts-8051-interrupt-programming
http://www.engineersgarage.com/microcontroller/8051projects/interface-rfid-AT89C51-serial-interrupt-circuit
here i am sending you the link how to interrupt in 8051
http://www.engineersgarage.com/tutorials/interrupts-8051-interrupt-programming
http://www.engineersgarage.com/microcontroller/8051projects/interface-rfid-AT89C51-serial-interrupt-circuit