传统20脚JTAG底座个头大，占用PCB面积多，连接线复杂。基于STM32F103C8T的SW模式Jlink，只需要三根线即可与目标板实现通讯，可实现程序下载，单步调试等功能，除了不能检测目标板电压、不能给目标板供电、速度有所降低之外，与完整版JLink的功能是一样的。当然，成本也可以降低很多(The traditional 20 foot JTAG base is large, occupies more PCB area, and has complex connection line. Jlink SW model based on STM32F103C8T requires only three wires and the target board to achieve communication, can realize the program download, step debugging and other functions, but can not detect the target board voltage, can not be to the target board, power supply, speed is reduced, and the full version of JLink function is the same. Of course, the cost can be reduced a lot)