The MB89590B/BW series is a line of general-purpose, single-chip microcontrollers. In addition to a compact instruction set, these microcontrollers contain a variety of peripheral functions, such as PLL clock control, timers, a serial interface, a PWM timer, the USB hub function, and the USB function. The USB hub function, in particular, supports five ports (one of them is dedicated to an internal function) allowing them to interface with other USB devices. The microcontrollers also contain one USB function channel to support high speeds.