ST's STM32F40x series are high-performance digital signal controllers (DSCs), using ARM Cortex ™ -M4F 32-bit RISC core, operating frequency up to 168 MHz, 210DMIPS performance, working voltage 1.7V-3.6V, ultra-low RTC Power consumption is less than 1uA, with excellent interface, integrated 1MB flash memory, 192KB SRAM, mainly used in POS / investment management, industrial automation and solar panels, transportation, medical equipment, buildings, test instruments, consumer electronics and communications And other equipment. This article introduces the main features of STM32F40x series, block diagram, main features of STM32F4DISCOVERY board, hardware block diagram and circuit diagram, component layout diagram, and block diagram of audio playback and recording module using STM32F4xx and STM32F4-DISCOVERY boards.

The STM32F405xx and STM32F407xx family is based on the high-perance 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 series main features:

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


figure 1. STM32F40x series block diagram

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