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you don't have the option of USB with PIC18F452, you can use serial interface, read the datasheet about the built in USART module, you will need MAX232 IC with some capacitors for line coding.
also the parallel port available, just you will program the parallel port pins and make it read/write from any GPIO pins of the microcontroller.
for USB you can use PIC18F4550 instead.
the RS232 interface is different from RS485, why don't use RS232 directly to interface your microcontroller to PC, MAX232 is used with RS232 interface so far as I know not RS485, another IC is associated with RS485, beside why you want to make a different protocol on your PC (i mean here RS485) while you can the standard RS232 protocol easily from your C++/matlab or Java code.
search for serial interfacing using PIC microcontrollers.
Re: how to interface I/O port of pic 18F microcontroller wit
I believe PIC18F452 has USB support....You can use the CDC firmware supplied by Microchip....It can emulate Serial Port over USB...through which you can communicate to PC.
Re: how to interface I/O port of pic 18F microcontroller wit
aviansun said:
I believe PIC18F452 has USB support....You can use the CDC firmware supplied by Microchip....It can emulate Serial Port over USB...through which you can communicate to PC.
USB Microchip Framework isn't available for PIC18F452 but for PIC18F4550 and some PIC24F and PIC32 families, if you want to use PIC18F452 then use serial interface RS232, you will need MAX232 IC too.
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