STC8A8K64S4A12 microcontroller smallest system board (simplest version)

Let me introduce to you the installation and testing of this board. Since there is only one person at home and no tools to take pictures, I can only introduce it in the form of pictures. I will upload a video of the test session for your reference. (Boss, please ignore it automatically) 1. First, give this board to Jialichuang or other board-making companies for board-making. (I made the board from Jiali Chuang, and I received the actual board as shown below) 2. Prepare the components required for the board and prepare to solder STC8A8K64S4A12. One chip package is LQFP64 (I will upload an e-book of the STC8 series in the attachment. You can Download and take a look) The single pin header requires a total of 68p. 8p requires 6, 4p2, and 6p2. The above are enough and can be used normally. The two capacitors above are used to prevent interference and do not need to be installed. The other LED and resistor can be installed if they are available. If not, there is no need to install them. The package is 0805. 3. Okay, here are the conditions for welding. Prepare a constant-temperature soldering iron, 936 or T12. Constant temperature is enough. Then you need rosin. You need to use rosin when welding. (This is just my personal habit. ), a knife head, and an appropriate amount of tin wire. One pair of tweezers, not sharp ones, but stronger ones, a downloader, a multimeter, and an appropriate amount of washing water. 4 Dupont lines. (The temperature during soldering depends on the melting point of your tin wire. My tin wire melts at 180 degrees. I soldered at 240 degrees. Anyway, the operating temperature is not too high) 4. Start welding (soldering steps) 1) Place the IC in the corresponding position, and be careful not to get the pins wrong. I made a mistake at the beginning and disassembled and re-soldered it; it was a waste of a board, as shown in the picture below; 2) After placing the IC in the position, use it with your left hand Press and hold with tweezers (the opposite is true for left-handers), as shown in the picture below; 3) After pressing, make the previously prepared rosin into blocks in advance, and take it to any row of IC pins with your right hand, as shown in the picture below; (MCU in this picture The pin position is wrong, just for demonstration) 4) Use a soldering iron to melt it, and after it cools down, you can remove the tweezers, as shown below; (The temperature of the soldering iron should not be too high, personally I think 240~300 is enough , varies from person to person.) 5) Follow the above method; solder the remaining pins with rosin as shown in the picture below; (Don’t be reluctant to give up the rosin, use more of it) 6) Clean the cutter head, as shown in the picture below; 7 .Put some tin on the tip of the soldering iron. Personally it feels ok, not too little, a little more will be fine; as shown in Figure 8) Then put the soldering iron to solder and it will be ok. Just solder while dragging, (as shown in the picture below) The soldered pins will be different from the pins next to them. Due to the pixel difference of the mobile phone, it was not photographed, but it can be clearly seen with the naked eye; 9) There will definitely be several pins connected with tin, so don’t panic. First, clean the cutter head, then put the cutter head on the side where the tin is connected, and pull it out. It usually comes out after just one pull. If it doesn't pull out, just pull it out a few times. Then, through the rosin, see if there is any If there is no weak soldering, just solder the other side, and if there is, just fix the soldering; (It’s hard to take pictures with a mobile phone; there are no pictures) 10) After everything is soldered, use board washing water and an old toothbrush to clean off the rosin on it; You can use toilet paper to absorb the mixture of rosin and washing water; as shown below; (I will upload a cleaning video) 11) After washing the board; as shown below 12) The most important thing is; use a 4p drain pin; weld it to the pad of GND TXD RXD VCC; test whether your IC can work, otherwise all the previous steps will be in vain, as shown below; (test tutorial will be released) 13) Connect the downloader to the one you just soldered through the Dupont line The 4 pins are connected; note that RXD on the downloader is connected to TXD on the board; TXD is connected to RXD on the board. Don’t make a mistake. If you make a mistake, you will not be able to download; as shown below; 14) Burn through stc Download the recording software into the MCU; connect the download port to the computer; open the software; select the corresponding MCU model; find the test hex file and download it; if the operation is successful, it will be OK; the board is ready for use; as shown in the figure; ( There is a slight delay when downloading; if it does not show that the download is successful after more than 3 seconds, there is a problem; the hex content of the test file has nothing, it is just a hex file, which does not affect subsequent measurements; it is the demo.hex file in the attachment. ) 15) Just solder the remaining pin headers and components; I don’t have capacitors and 0805 LEDs and resistors; I won’t solder them for the time being; this does not affect the use; as shown in the picture, I have soldered them; 16) There may be weak soldering In this case, use a multimeter to test the DC voltage range; after the microcontroller is powered, the default is the height level; so use a multimeter to set the DC range to 20v; the black test lead is connected to GND, and the red test lead touches all output IO; the A pin above Except, this is just for symmetry, I don’t know what its use is for the time being; other IO ports should display 5v on the multimeter; find the pins that are soldered, and use a soldering iron to add tin, or a soldering iron Just iron it, usually I have more solder when welding; generally there is no false soldering, it was there before, but not now; test as shown below; 17) At this point, all the board precautions are gone, I have uploaded a breathing light below For LED testing, find an LED and a 470 ohm resistor, connect the two in series, and then use two lines to connect the P10 pin and GND of the microcontroller respectively. Note that the crystal oscillator frequency must be 11.0952m when downloading, (as shown below) Others don't have this effect. The hex file of the breathing light has also been uploaded. If you don't understand anything, you can discuss it below. (If you can’t watch the video online, you can download it!) The picture below is of Rosin