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8051 AVR MCU Minimum System Development Board Microcontroller Programmer E-947 The IO port is all led out, the classic minimal 51 system, eliminating soldering problems Integrated ISP 10P download interface, AT89S52 microcontroller easy to download. Welding is a round hole outlet to easily replace the crystal oscillator (default is 11.0592 M) Support chip: STC89C52 STC12C5A60S2 STC11 / 10x series AT89S52 chip compatible with the chip pin A switch for an easy experience. Power input 2 ways: DC-005 socket (the support seat is 5.5 * 2.1) and a row pin (next to the power switch). Expand 3 channels of VCC and GND as shown in the headings of the pins in the figure. Port P0 with extraction resistance. Reset mode: power on reset and external button reset.