AVR-Chat

At 10:25 AM 2/24/2005, Hugo Oliveira wrote:

>Hello Everyone,
>  Thats my first time writing to this group and I have a question
>concerned with USB interface. I hope any of you can help me.
>
>I am developing a board that uses the a new ATMEL microcontroller
>(AT90PWM). I need this board to have a interface that will let me plug
>16 of these in a PC. I am considering USB (with one ore two USB hubs)
>but my microcontroller does not have this interface. I have a USART
>and a SPI though. Are there such a thing like a USART <> USB chips
>available? I dont what that part of my project to take a great deal of
>time. It does not have to be a very cheap solution because it
>represents only a small share of the project.


FTDI makes serial port chips that will do the interface for you.
They show up on the PC as a serial port, and connect directly to your uart 
signals.
You'll need to implement hardware handshaking.