How a micro-controller programmer works

Oct 28, 2005 2 Replies
N

Hi,



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



Thanks Nader


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C

Not familiar with this specific product, but RTS and CTS are control rather than data signals for the serial port, which can probably be set under software control.

What it sounds like they are doing is not using the serial port for it's designed asynchronous serial function at all, but rather using it just to get two software controlled bits to bit-bang a synchronous (data and seperate clock) serial signal that the PIC may more easily handle - it's not RS232.

bits of a parallel port.

Unless the serial txd and rxd signals are also connected to something - if that's so, then disregard this post.

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J
[...]

You can also toggle TxD manually by using the break-condition.

/Jan-Hinnerk

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