The SH6883 is designed for high performance Low-speed USB devices. It contains an 8051 micro-controller, Low-Speed USB SIE, Transceiver and data FIFO, build-in 3.3V regulator, on-chip 8K bytes Mask ROM and internal 256 bytes data RAM, Time capture circuit, Base timer, programmable Watch-dog timer and Wake-up timer, 37 Selectable GPIO (on 48-pin LQFP package), support multiple type LED driving capability for different application, build-in internal 32KHz oscillator, POR and LVR circuit saving your external components cost