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 Features

STM32 master chip introduction

Kernel : Cortex-M3 32-bit RISC
Operating frequency : 72MHz, 1.25 DMIPS / MHz; Operating voltage: 2- 3.6V;
Package : LQFP64; I / O ports: 64;
Storage resources : 256kB Flash, 48kB RAM (and so easily ported UCGUI LWIP more resource-intensive protocol packets can develop a more powerful program)
Interface resources : 2xSPI, 5xUSART, 1xI2S, 2xI2C; 　　　　　
                    1xLCD, 1xSDIO, 1xUSB, 1xCAN
Analog to digital conversion : 3xAD (12 Wei, 1us, sharing 16 channels), 2xDA (12-bit);
Debug Download : Support for JTAG / SWD interface debug download support IAP.

Voltage regulator chip : AMS1117-3.3V chip, a voltage regulator is 3.3V.

JTAG / SWD interface - to support downloading and simulation debugging.

USB interfaces - to the circuit board power supply with protective diode at the same time there are two high-capacity electrolytic capacitor (to be able to stabilize the external power supply)

MCU pin interface - leads to all pins, convenient and peripherals I / O connections.

5V and 3.3V power supply input and output interfaces - commonly used in the external power supply, or with the user board common ground handling. (Multiple sets of power)

4 Screw positioning holes (and with pillars)

Power switch (such as a short circuit when the outside world can quickly turn off the power, but also can be an external power module from the new convenience)

Interface Overview

JTAG / SWD interface to support downloading and debugging.

USB interface - can be USB communication with PC.
USART1 interfaces - can be used USART1 for download, or use
USART1 output system information, observation.
MCU pin interface - leads to all pins, convenient and peripherals I / O connections.
5V and 3.3V power supply input and output interfaces - commonly used in the external power supply, or with the user board common ground handling.

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