The pin refers to the connection between the internal circuit of the integrated circuit (chip) and the peripheral circuit, and the pin constitutes the interface of the chip. According to the function, the pins of AT89S52 can be divided into four categories: main power supply, external crystal oscillator or oscillator, multi-function I/O port, and control, strobe and reset. Terminal Pins,Terminal Hardware Pin,High Precision Terminal Pins,Terminal Pins For Pcb Sichuan Xinlian electronic science and technology Company , https://www.sztmlch.com
Installation process 1 Download the sofa butler installation file to the U disk → 2U disk to insert the cool box USB interface → 3 local play to open the installation file → 4 installation is successful
Steps
1. Baidu search for "sofa manager" into the sofa network, download the sofa butler package; or directly click the link (http://app.shafa.com/shafa.apk) to download the sofa butler package. 
Copy the downloaded apk installation package to the U disk.
2 cool box into the U disk, to the application → local play → USB_DISK0 → install the application 
3. Click to find the sofa butler installation package, click to start the installation; 
4. After the installation is complete, you can directly open the sofa butler. 
If you still can not read the U disk, it is recommended to format the U disk to FAT32 format (if there are other contents in the U disk, export and then format), or try another U disk.
If the installation fails, restart the device and try again by following the steps (may be useful). Still have questions please add the official QQ group below.
Cool box AK6 how to install third-party software through U disk, see live tutorial
The cool box AK6 installs the sofa housekeeper through the U disk. Other models of the cool box can also refer to this tutorial.
Watch on-demand video on smart TV, recommend using pudding video; Watch live TV, recommend HDP live broadcast; More interesting content, please use Tencent video TV version, TV; Fun smart TV and box, more exciting content in Sofa net.