STC15W4K58S4 core board

USB online automatic downloader, IAP15W4K58S4 core board, with simulation function, can be used as a minimum system board, or the board can be broken off to be used as a minimum system board and automatic downloader!

The picture below is the online download circuit:
    ![Principle.png] The picture below is the IAP15W4K58S4 core board:
  ![Core board.png] Added a P3.2/P3.3 pin simulation design to allow the switch.

PCB:
  Empty board front:
  ! [IMG_20191118_074816_BOTTOM.png] The reverse side of the blank board:

![IMG_20191118_074839_top.png]     The front side of the welded PCB:
  ![Welded finished product.jpg]
Error debugging instructions are in the attachment.

Video link:
   [http://v.youku.com/v\_show/id\_XNDQ0NDA3NDAzNg==.html?x&sharefrom=android&sharekey=39ea716536f63c96b48f1c6314402ca27](http://v.youku.com/v_show/id_XNDQ0NDA3NDAzNg==.html ?x&sharefrom=android&sharekey=39ea716536f63c96b48f1c6314402ca27)