Feature:1. The most basic circuits based on MCU are onboard, such as crystal oscillator circuit, power conversion circuit and USB port. The core board leads to commonly used I/O resources.2. Added EEPROM, memory card/Mrico memory card and SPIFlsh peripherals, and reserved NandFlash peripheral pads to expand the storage circuit.3. The SWD simulation debugging download interface is lead out, and the debugging simulation downloader downloads, convenient and simple. It uses the Mirco USB interface commonly used in smart phones, which is easy to use and can be used for USB communication and power supply.4. A low-load RTC crystal oscillator solution is adopted, which largely avoids the problem of RTC not vibrating due to the use of cheap cylindrical crystal oscillators.5. Equipped with high‑quality 2.54mm pitch double‑row pin headers to ensure excellent electrical contact, which is convenient for users to place the core board on the marked universal board or breadboard. Users can choose the welding direction according to their actual needs.Specification:Item Type: Development BoardMaterial: PCBPurpose: Suitable for operation learning and development of college students, engineers, technicians, factories, individual DIY, electronic enthusiasts, etc.Number Of Pins: 114Core: ARM 32-bit Cortex-M1+FPUWorking Frequency: 168MHzStorage Source: 1021K Byte Flash, 192KBvte RAMInterface Source: 3 x SPI, 4 x USART, 2 x UART, 3 x 12C, 2 x CAN, 114 x I/O port, 2 x USB (OTG), 1 x SDIO, 2 x I2S, 1 x 10/100 Ethernet Media Access Controller, 1 x DCMI (digital camera interface)Analog-to-Digital Conversion: 3 x ADC (12 bits/21 channels)Digital-to-Analog Conversion: 2 x DAC (12 bits/2 channels)Timer: 10 x general-purpose timer2 x advanced timer2 x basic timerDebug Download: Support JTAG/SWD debug download through portWorking Voltage: 1.8-3.6VSWD Interface: Support simulation, download and debuggingReset Button: Used for the user to reset the chip programBOOT Setting (" 1 "for The Letter End, " 0 " for The Number end, and " 0 " for factory default) There are three ways: User flash memory/SRAM/system memoryUser LED (PG15): Convenient for 1/0 output test or indicating program running statusPower LED (PWR): Power indicator status, it can be judged whether the power is stable.Mirco USB Port: Power supply and USB communication function, does not support program download..Package List:1 x Development Board5 x Pin Header