The smallest system board of 89C52 microcontroller with RAM expansion, fully automatic download, and the style adopts the alchemy furnace style on the STC official website.
A 52-bit microcontroller packaged in LQFP-44 is used, so the P4 port of P4.0-P4.6 is introduced and supports bit addressing.
With self-restoring fuse and power reverse connection protection, the crystal oscillator is directly plugged in for 49-s, and the P0 port has an optional pull-up resistor.
After testing, the programming program and serial port communication are normal, the IO port is normal, and xdata has not been tested yet.
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