brief introduction: A microcontroller is a single-chip microcomputer that integrates the main parts of a microcomputer on a single chip.Microcontroller was born in the mid-1970s, after more than 20 years of development, its cost is lower and lower, and the performance is more and more powerful, which makes its application has been everywhere, in every field.Examples include motor control, barcode readers/scanners, consumer electronics, gaming equipment, telephone, HVAC, building security and access control, industr