The newly defined rd8g37q48rj class STC89C52/c51 dip40 socket microcontroller minimum system

Board1 initially used a micro connector, but later Board1-1 was added using a Type-C 16-pin connector for greater versatility and easier cable matching.
The silkscreen markings were also modified for easier connection and integration with RD Link Pro.
**Important Note:** This project uses the QFN48 chip, requiring a hot air gun or PTC heating plate for soldering.
A 32.768kHz crystal oscillator slot is reserved in this project for future use.
SW1 is the reset button, and SW2 corresponds to pin P3.2.
LED1 is the power indicator, and LED2 corresponds to pin P4.3.
The image is for verification purposes only; the actual project version should be considered the final version. Redundant silkscreen markings, such as the school logo, have been removed in this project version.
The two rows of 1*20p-2.54 pin headers are the same as those in the STC89C52, designed and arranged according to the DIP40 package. The remaining parts have been differentiated according to function and are arranged on the 2*5p sockets.
A 1*4p socket has been provided for connection with RD Link Pro, facilitating simulation programming and adjustments.
The resistor array has been removed in the actual version; please configure the external circuit as needed. Except for the resistor array, silkscreen, and interface verification version, there are no major differences from the current version, and the circuit has no unnecessary modifications.
A Type-C-6p interface may be used in the future for easier soldering, and some development boards and example baseboards for related routines may be made to adapt to this minimum system board.
Currently, this sub-minimum system board can be used to replace the DIP40 packaged 8051 application scenario, and offers a more convenient and faster configuration and programming method.
The 32.768kHz crystal oscillator uses an equal-length arrangement, which conforms to the design specifications.