51 MCU programming process and detailed description

Step 1: Install Keil software

1. Select the C51V900 installation program in the folder and open it, as shown in the figure:

2. Keep selecting Next in the installation dialog box until Finish completes the Keil installation.

Step 2: Install the USB to Serial Cable Driver

1. Select and open the HL-340 installer in the folder

2. Click INSTALL to automatically complete the installation

Step 3: Create a Keil project

1. Open the Keil icon on the desktop and create a new project. Click [New μVision Project] in the [Project] menu, as shown below:

2. Select the location to save the project. It is recommended to create a new folder to save the project file for easy management in the future.

3. Select the microcontroller model: Open the Atmel directory, select AT89C52 in the subdirectory, click OK, and select No (N) in the new dialog box that pops up.

4. Click the [New] menu item in the [File] menu, or press Ctrl+N to create a new file Text1 , click the icon in the toolbar or press Ctrl+S, enter the file name in the pop-up save dialog box, and note that you must add ".c" after the file name as the saved file type (for example, shuangshuangbang.c), and then save. [page]

5. Return to the editing interface, click the "+" sign in front of [Target], and then right-click on the [Source Group 1] option to pop up the menu shown in the figure below. Then select the [Add Files to Group 'Source Group1'] menu item, as shown below:

6. In the pop-up dialog box, select the "XXX.c" file you just saved and click [Add], then click [Close], as shown in the figure:

7. Click the "+" sign in front of [Source Group 1] on the left. You can notice that there is an additional sub-item [XXX.c] in the [Source Group 1] folder. The source code file is now associated with the project. Copy Viagra's code from the "XXX.c" code editing window on the right, as shown in the figure:

8. Click [Target Options…] on the toolbar, open the Output tab and select [Create Hex File], click [OK]. Only after the compilation is completed will a Hex file that can be downloaded to the microcontroller be generated, as shown below:

[page]

8. Click [Rebuild] on the toolbar, and you can see the status displayed in the status bar (0 errors and 0 warnings). At this time, the establishment of the Keil project is completed and a Hex file that can be downloaded to the microcontroller is generated, as shown below:

Step 4: Query the COM port

1. Use a USB to serial port cable to connect the computer's USB port to the microcontroller's serial port;

2. Right-click "My Computer" and click "Manage". In the pop-up window, select "Device Manager". Click "Port" on the right to see the COM port of the USB-to-serial cable (COM3 port in the figure). Remember that the COM port is displayed, which will be used when downloading the program, as shown in the figure below:

Step 5: Download the Hex file

1. Open the "Program Download" compressed package in the folder and open the STC_ISP_V481.exe program inside, as shown in the figure:

2. In the pop-up interface, select MCU Type as STC89C52RC, click [Open Program File], find the file with the ".hex" suffix in the location where you saved the Keil project before, and choose to open it. Select "COM" as the COM port displayed in Step 4 (my computer shows COM3, so I chose COM3, but different computers may be different, so be sure to choose according to your own computer), as shown below:

2. Finally, click [Download] (before clicking [Download], the MCU must not be powered on), and then press the power switch of the MCU to power on the MCU. At this time, the program will start to download to the MCU. The following figure shows that the program has been successfully burned into the MCU. You only need to install the MCU with the program burned into the Shuangshuang stick: