l l l l l l l l l l l l l l 8051 core. 384-bytes internal RAM. 32K-bytes program Flash ROM. 14-channels 5V open-drain PWM DAC, 10 dedicated channels and 4 channels shared with I/O pin. 28 bi-direction I/O pin,12 dedicated pin,12 shared with DAC, 4 shared with DDC/IIC interface. 3-output pin shared.