The STM32F405xx and STM32F407xx series are based on high-performance ARM Cortex-M4 32-bit RISC cores, operating at frequencies up to 168 MHz. The Cortex-M4 kernel has floating-point unit (FPU) single precision and supports all ARM single precision data processing instructions and data types. It also implements a complete set of DSP instructions and memory protection units (MPUs), thereby enhancing application security. The STM32F405xx and STM32F407xx series integrate high-speed embedded memory (up to 1 MB of flash memory, up to 192 KB of SRAM), up to 4 KB of backup SRAM, as well as various enhanced I/O and peripherals connected to two APB buses, three AHB buses, and a 32-bit multi AHB bus matrix. All devices provide 3 12 bit ADCs, 2 DACs, 1 low-power RTC, 12 universal 16 bit timers (including 2 PWM timers for motor control), and 2 universal 32-bit timers. True Random Number Generator (RNG). They also have standard and advanced communication interfaces.
main features 
Kernel: ARM ®  32-bit Cortex ® -M4 CPU， Equipped with FPU and adaptive real-time accelerator (ART accelerator) ™）， Allow execution of 0 wait state from flash memory, with frequencies up to 168 MHz, memory protection unit, 210 DMIPS/1.25 DMIPS/MHz (Dhrystone 2.1), and DSP instructions
memory
Up to 1 MB of flash memory
Up to 192+4 KB of SRAM, including 64 KB of CCM (Core Coupled Memory) data RAM
Flexible static memory controller, supporting compact flash memory, SRAM, PSRAM, and NAND memory
LCD parallel interface, 8080/6800 mode
Clock, reset, and power management
1.8 V to 3.6 V application power supply and I/O
POR, PDR, PVD, and BOR
4 to 26 MHz crystal oscillator
Internal 16 MHz factory adjustment RC (accuracy of 1%)
32 kHz oscillator for RTC calibration
Internal 32 kHz RC with calibration
Sleep, stop, and standby modes
V Bat RTC, 20 x 32-bit backup register power supply+optional 4 KB backup SRAM
3 x 12 bit, 2.4 MSPS A/D converter: up to 24 channels and 7.2 MSPS in triple interleaving mode
2x12 bit D/A converter
Universal DMA: A 16 stream DMA controller with FIFO and burst support
Up to 17 timers: up to 12 16 bit timers and 2 32-bit timers, with a frequency of up to 168 MHz, each with up to 4 IC/OC/PWM or pulse counters and orthogonal (incremental) encoder inputs
Debugging mode
Serial Line Debugging (SWD) and JTAG Interface
Cortex-M4 embedded tracking macro unit ™
Up to 140 I/O ports with interrupt function
Up to 136 fast I/O, with frequencies up to 84 MHz
Up to 138 5 V margin I/Os
Up to 15 communication interfaces
Up to 3 x I ² C interfaces (SMBus/PMBus)
Up to 4 USART/2 UARTs (10.5 Mbit/s, ISO 7816 interface, LIN, IrDA, modem control)
Up to 3 SPIs (42 Mbits/s), 2 of which have multiplexed full duplex I2S and can achieve audio level accuracy through internal audio PLL or external clock
2 x CAN interface (2.0B activity)
SDIO interface
Advanced Connection
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
8-14 bit parallel camera interface, with a speed of up to 54 MB/s
True Random Number Generator 
CRC computing unit
96 digit unique ID
RTC: Sub second precision, hardware calendar