Introduction - If you have any usage issues, please Google them yourself
This is based on whether a single chip computer (Microcontrollers) provides a parallel bus. The bus is provided with MCU general parallel address bus, data bus and control bus, these pins for extended parallel peripheral devices can be connected with the microcontroller through the serial port, in addition, many SCM has to the needs of the peripheral device and a peripheral interface integrated on-chip, so in many cases can not parallel expansion bus greatly reduce the packaging cost and chip size, this kind of chip called non bus mcu.