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ST公司的STM32F40x 系列是高性能的數字信號控制器（DSC），采用ARM Cortex™-M4F 32位RISC內核，工作頻率高達168 MHz，具有210DMIPS性能，工作電壓1.7V-3.6V，RTC的超低功耗小于1uA，具有優異的接口，集成了1MB閃存，192KB SRAM，主要用在POS/投資管理，工業自動化和太陽能電池板，交通運輸，醫療設備，建筑物，測試儀表，消費類電子和通信等設備。本文介紹了STM32F40x 系列主要特性，方框圖，STM32F4DISCOVERY板主要特性，硬件框圖和電路圖，元件布局圖，以及采用STM32F4xx和STM32F4-DISCOVERY板的音頻播放和錄音模塊框圖。 The STM32F405xx and STM32F407xx family is based on the high-performance ARM®Cortex™-M4F 32-bit RISC core operating at a frequency of up to 168 MHz. The Cortex-M4F core features a Floating point unit (FPU) single precision which supports all ARM single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances application security. The STM32F405xx and STM32F407xx family incorporates high-speed embedded memories (Flash memory up to 1 Mbyte, up to 192 Kbytes of SRAM), up to 4 Kbytes of backup SRAM, and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix. All devices offer three 12-bit ADCs, two DACs, a low-power RTC, twelve general-purpose 16-bit timers including two PWM timers for motor control, two general-purpose 32-bit timers. a true number random generator (RNG). They also feature standard and advanced communication interfaces. STM32F40x 系列主要特性： Core: ARM 32-bit Cortex™-M4F CPU with FPU, Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait state execution from Flash memory, frequency up to 168 MHz, memory protection unit, 210 DMIPS/1.25 DMIPS/MHz (Dhrystone 2.1), and DSP instructions Memories Up to 1 Mbyte of Flash memory Up to 192+4 Kbytes of SRAM including 64-Kbyte of CCM (core coupled memory) data RAM Flexible static memory controller supporting Compact Flash, SRAM, PSRAM, NOR and NAND memories LCD parallel interface, 8080/6800 modes Clock, reset and supply management 1.8 V to 3.6 V application supply and I/Os POR, PDR, PVD and BOR 4-to-26 MHz crystal oscillator Internal 16 MHz factory-trimmed RC (1% accuracy) 32 kHz oscillator for RTC with calibration Internal 32 kHz RC with calibration Sleep, Stop and Standby modes VBATsupply for RTC, 20×32 bit backup registers + optional 4 KB backup SRAM 3×12-bit, 2.4 MSPS A/D converters: up to 24 channels and 7.2 MSPS in triple interleaved mode 2×12-bit D/A converters General-purpose DMA: 16-stream DMA controller with FIFOs and burst support Up to 17 timers: up to twelve 16-bit and two 32-bit timers up to 168 MHz, each with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input Debug mode Serial wire debug (SWD) & JTAG interfaces Cortex-M4F Embedded Trace Macrocell™ Up to 140 I/O ports with interrupt capability Up to 136 fast I/Os up to 84 MHz Up to 138 5 V-tolerant I/Os Up to 15 communication interfaces Up to 3 × I2C interfaces (SMBus/PMBus) Up to 4 USARTs/2 UARTs (10.5 Mbit/s, ISO 7816 interface, LIN, IrDA, modem control) Up to 3 SPIs (37.5 Mbits/s), 2 with muxed full-duplex I2S to achieve audio class accuracy via internal audio PLL or external clock 2 × CAN interfaces (2.0B Active) SDIO interface Advanced connectivity USB 2.0 full-speed device/host/OTG controller with on-chip PHY USB 2.0 high-speed/full-speed device/host/OTG controller with dedicated DMA, on-chip full-speed PHY and ULPI 10/100 Ethernet MAC with dedicated DMA: supports IEEE 1588v2 hardware, MII/RMII 8- to 14-bit parallel camera interface up to 54 Mbytes/s Analog random number generator CRC calculation unit, 96-bit unique ID RTC: subsecond accuracy, hardware calendar 
圖1。STM32F40x 系列方框圖 STM32F4DISCOVERY板 STM32F4 high-performance discovery board The STM32F4DISCOVERY helps you to discover the STM32F4 high-performance features and to develop your applications. It is based on an STM32F407VGT6 and includes an STLINK/V2 embedded debug tool interface, ST MEMS digital accelerometer, ST MEMS digital microphone, audio DAC with integrated class D speaker driver, LEDs, pushbuttons and an USB OTG micro-AB connector. The STM32F4DISCOVERY helps you to discover the STM32F4 high-performance features and to develop your applications. It is based on an STM32F407VGT6 and includes an STLINK/V2 embedded debug tool interface, ST MEMS digital accelerometer, ST MEMS digital microphone, audio DAC with integrated class D speaker driver, LEDs, pushbuttons and an USB OTG micro-AB connector。 STM32F4DISCOVERY板主要特性： The STM32F4DISCOVERY offers the following features: ● STM32F407VGT6 microcontroller featuring 1 MB of Flash memory, 192 KB of RAM in an LQFP100 package ● On-board ST-LINK/V2 with selection mode switch to use the kit as a standalone ST-LINK/V2 (with SWD connector for programming and debugging) ● Board power supply: through USB bus or from an external 5V supply voltage ● External application power supply: 3V and 5V ● LIS302DL, ST MEMS motion sensor, 3-axis digital output accelerometer ● MP45DT02, ST MEMS audio sensor, omnidirectional digital microphone ● CS43L22, audio DAC with integrated class D speaker driver ● Eight LEDs: – LD1 (red/green) for USB communication – LD2 (red) for 3.3V power on Four user LEDs, LD3 (orange), LD4 (green), LD5 (red) and LD6 (blue) – 2 USB OTG LEDs LD7 (green) VBus and LD8 (red) over-current ● Two pushbuttons (user and reset) ● USB OTG with micro-AB connector ● Extension header for LQFP100 I/Os for quick connection to prototyping board and easy probing
圖2。STM32F4DISCOVERY板外形圖
圖3。STM32F4DISCOVERY板硬件框圖
圖4。STM32F4DISCOVERY板電路圖（1）
圖5。STM32F4DISCOVERY板電路圖（2）
圖6。STM32F4DISCOVERY板電路圖（3）
圖7。STM32F4DISCOVERY板電路圖（4）
圖8。STM32F4DISCOVERY板電路圖（5）
圖9。STM32F4DISCOVERY板電路圖（6）
圖10。STM32F4DISCOVERY板元件布局圖
圖11。采用STM32F4xx和STM32F4-DISCOVERY板的音頻播放和錄音模塊框圖 詳情請見： 
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