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Jon Titus
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Re: Introduction: Fundamentals of Designing With Microcontrollers
Jon Titus   1/16/2012 7:54:20 PM
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Q: is usb an extenal hardware to a MCU  or just  a software?

A:  Actually both.  The MCU provides the hardware that implements the bus timing and a state-machine.  For information, see the PIC18F2455 data sheet at: http://ww1.microchip.com/downloads/en/DeviceDoc/39632e.pdf.  Also see Jan Axelson's book "USB Complete."  You need a good knowledge of how the USB operates before you implement it.  You will need a software stack, too.



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