How a micro-controller programmer works

Hi,

Could someone describe to me how a microcontroller programmer can program
a microchip, using RS232 signals. Taking a simple JDM programmer to
program a PIC16C84, I don't understand how RTS and CTS signals, which are
onnected to data and clock pins (RB6 and RB7, if I am right!) can send
program to the chip. I am confused ! I wanted to simulate the JDM circuit
(using PSPice) to figure how the circuit functions, but I don't know how I
should simulate the RS232. Could you please help me understand how
programmer works.

Thanks
Nader


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