ST公司的STM32F40x 系列是高性能" title="高性能">高性能的數(shù)字信號控制器（DSC）,，采用ARM Cortex™-M4F 32位RISC內(nèi)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" title="超低功耗">超低功耗小于1uA,，具有優(yōu)異的接口,，集成了1MB閃存，192KB SRAM,，主要用在POS/投資管理,，工業(yè)自動化" title="工業(yè)自動化">工業(yè)自動化和太陽能電池板，交通運輸,，醫(yī)療設(shè)備,，建筑物，測試儀表" title="測試儀表">測試儀表,，消費類電子和通信等設(shè)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：
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/DM00037051.pdf
和
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/USER_MANUAL/DM00039084.pdf
