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For STC series microcontrollers, if you want to perform ISP download, you must receive the serial port command of the STC-ISP software during power-on reset before starting to execute the ISP program, that is, cold start download. If you use an ordinary USB to TTL serial port downloader, you need to manually power off and then power on the STC microcontroller. Frequent manual operations are not convenient enough. Therefore, using this module can avoid the trouble of frequently manually powering off and powering on the STC, and automatically performs power-off and power-on downloading procedures. When not used for STC program download, it can be used as an ordinary serial port module. Leading out the RTS and DTR flow control pins, the module is compatible with 5V/3.3V TTL level communication. Module size: 38.6mm*25.3mm Let's take a Windows 10 computer as an example. Use a USB Type-C cable to connect the module to the computer and install the CH340 serial port driver. A port COMx can be identified in the computer device manager. The port number varies from computer to computer. This module is also compatible with Linux computers and macOS computers, and the corresponding system drivers need to be installed in advance. Size：38.6*25.3mm Note:  The installation of electronic modules requires basic knowledge and requires a certain electronic professional foundation and hands-on ability. Please purchase carefully! Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Welcome to our shop We still have a lot of inventory not uploaded to AliExpress,small profits but quick turnover guaranteed quality If you need more please contact us We will adjust the price to serve you better If there are other suppliers and any other requirements that we do not show in AliExpress, please contact us by creati