STC8H8K64U Minimum System Board (STC Microcontroller Creative Design Competition)

This design uses the STC8H8K64U-45I-LQFP48 main controller as the core of the development board.
Features include:
Core: • Ultra-high-speed 8051 core (1T), approximately 12 times faster than the traditional 8051, instruction code fully compatible with the traditional 8051 • 22 interrupt sources, 4 interrupt priority levels • Supports online simulation Operating Voltage: 1.9V～5.5V Operating Temperature: -40℃～85℃
Main Control Circuit:
External crystal oscillator, reset, power indicator,
5V to 3.3V conversion, LDO linear regulator, expanding the microcontroller's power interface to power external modules
. The digital tube display section, running lights, and external expansion button circuit mainly use ULN2803 to drive the digital tube and an active buzzer, enriching the microcontroller's playability.
Power supply and download circuit (there should be three types of downloads here).
CH340 is a USB bus adapter chip, implementing USB to serial port or USB to printer port conversion. The CH340 is a domestically produced chip with a wide range of applications and a high market share. Other commonly used USB-to-serial chips include the CP2102, PL2303, and FT232, but the CH340 offers the best price-performance ratio. Connecting the CH340 to the on-chip UART of a microcontroller (MCU) via a serial converter enables one-click programming. The complete
pinout schematic is attached (too blurry). The PCB layout is a bit ugly—but it works (just kidding!). A 3D preview of the PCB (the crystal oscillator is on the back—a little panicked!). The actual product is ready! The project is complete (I'm a newbie, so I need more practice) . Thanks to JLCPCB for the free coupon! A godsend for electronics enthusiasts! (Very loudly)