The M66291 is a general purpose USB (Universal Serial Bus) device controller compliant with the USB Specification Revision 2.0 and supports full speed transfer. The USB transceiver circuit is included, and the M66291 meets all transfer types which are defined in the USB specification. The M66291 has FIFO of 3 Kbytes for data transfer and can set 7 endpoints (maximum). Each endpoint can be set programmable of its transfer condition, so can correspond to each device class transfer system of USB.