The USB interface is becoming more and more popular due to its convenience and speed. Compared with the previous parallel and serial port programmers, the USB interface programmer has the advantages of no need for external power supply and fast download speed, so it is increasingly widely used. However, the price of USB control chip makes the USB interface programmer higher than other interface programmers. This design uses the characteristics of most instructions of AVR microcontrollers as single cycle with high-speed transmission. It is directly connected to the USB bus through the IO port of the microcontroller, realizing the functions of low-speed devices specified by the USB specification, thus eliminating the need for an external USB control chip and reducing the hardware development cost.
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