Really cheap microcontroller CH55x based on C51 core (AT89C2051, AT89C51) you can buy for a few cents.
In this video tutorial, you will find how to program this microcontroller and also a few example codes (LEDs, PWM, USB CDC, I2C and also SPI).
CH552 – the C51 microcontroleler for 0.3 USD and how to program it
Author: Petr Šrámek
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