The CH340G chip is a very popular USB to Serial chip used in Arduino clones because of its low cost. The OEM of this chip is Jiangsu Qinheng Co., Ltd. in the Nanjing Software Valley of China according ...
Arduino support for STC8 microcontrollers with a familiar Arduino-like API. Note: P3_2 and P3_3 can using FALLING, RISING or CHANGE modes, while other pins only support FALLING mode.