Product Overview

Core Product Features

1. Dual Chip Compatibility Design
   Supports STC89C52RC traditional 51 chip and STC12C5A60S2 enhanced 51 chip; different P0 port drive modes for two versions: STC89 series needs external pull-up resistor for high-current driving, STC12 series can configure IO mode via register without extra resistor.
2. Integrated CH340 USB-TTL Download Circuit
   Onboard CH340 chip, Type-C one-line power supply & program download, no extra serial adapter required; comes with complete CH340 driver files, compatible with Windows / Linux systems.
3. Full IO Pin Expansion & Rich Reserved Interfaces
   All P0/P1/P2/P3/P4 IO ports fully broken out, reserved dedicated TFT color screen LCD interface, power expansion terminal, crystal oscillator circuit; matched male/female pin headers for flexible wiring with sensors, LCD1602, LCD12864 and other modules.
4. Complete Onboard Basic Peripherals
   Independent reset button, power indicator light, TX/RX serial transceiver status LED, power switch, stable crystal oscillator circuit, standard minimum system peripheral circuit, plug and play after soldering pin headers.
5. Ultra-small Compact PCB & Light Weight
   PCB size 62.5×38.5mm, net weight only 13.7g, easy to embed into small equipment, convenient for portable experimental projects.
6. Full Set Supporting Technical Materials
   Comes with CH340 driver, programming software, burning tool, schematic, demo code, download operation tutorial, complete data package for quick development.

Full Technical Specifications

P0 Port IO Mode Description

STC89C52RC Version

STC12C5A60S2 Version

1. 00: Quasi-bidirectional traditional 51 IO mode
2. 01: Push-pull strong output, max 20mA drive current
3. 10: High-impedance input only
4. 11: Open drain, need external pull-up resistor

Wiring & Operation Guide

1. Pin Header Soldering: Solder the supplied pin headers to the board as required, convenient for external module connection.
2. Power Supply: Plug Type-C cable into computer USB or 5V power adapter to supply power, power indicator lights up normally.
3. Program Download: Install CH340 driver, open STC burning software, select corresponding chip model, load hex file to complete one-click download.
4. Peripheral Expansion: Connect LCD screen, sensor modules to corresponding IO pins, reference supporting demo code for function development.

Application Scenarios

• College electronic technology experiment, 51 single-chip microcomputer teaching training
• Student DIY intelligent car, temperature & humidity detection, alarm, digital clock production
• Embedded small control system prototype debugging, industrial simple control board development
• Beginner entry learning platform for 51 MCU programming

Important Usage Notes

1. Distinguish the chip version when writing programs, the P0 port driving mode is different between STC89 and STC12 series.
2. When STC89 chip P0 port drives high-power loads, must add external pull-up resistors to avoid abnormal IO output.
3. Use standard Type-C 5V power supply, do not input overvoltage to prevent burning the CH340 and main control chip.
4. PCB silkscreen, capacitor and pin header color may have slight batch differences, which will not affect core functions.