AVR-Chat

The Atmel AT43USB370 and AT43USB380 can serve as USB hosts.  There 
is a fair amount of software involved, but it can be drastically 
simplified in the data logging application described if you decide 
you only want to talk to mass storage-class devices (such as the USB 
key drives) and provide support for only one connected device.  

Bit-banging a USB at 12Mbps is pretty much out of the question, I 
think.  It could be (and has been) done at 1.5Mbps, but 
unfortunately for the host it's the slave device that gets to 
determie the data rate and all the memory sticks I've seen are full 
speed (12Mbps) or high speed (12Mbps during enumeration, usually a 
choice of 12Mbps or 480Mbps thereafter).

---Joel Kolstad