M4是偏向DSP的吧，
Tmicroelectronics STM32 F4 High-Performance Cortex™-M4 MCUs
STMicroelectronics STM32 F4 32-bit Cortex™-M4 Microcontrollers (MCUs) open the door to the digital signal controller (DSC) market with a family of devices that are pin-to-pin and software compatible with the STM32 F2 series but with more performance, DSPcapability, more SRAM, and peripheral improvements such as full duplex I2S, less than 1μA RTC, and 2.44MSPS ADCs. STMicroelectronics STM32 F4 MCUs include a floating point unit and core features such as built-in single-cycle multiply-accumulate (MAC) instructions, optimized SIMD arithmetic, and saturating arithmetic instructions. The adaptive realtime ART Accelerator™ combined with STMicroelectronics 90 nm technology provides linear performance up to 168MHz, unleashing the full performance of the core. These features expand the number of addressable applications in the industrial, consumer, and healthcare segments. STM32 F4 series MCUs include devices with 512KB to 1MB of on-chip Flash memory, 192KB of SRAM, and 15 communication interfaces.
淘宝之类的网站也有得卖的！！
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