84 MHz ARM Cortex-M4 with DSP and FPU — the feature set that defines the part
The STM32F401RCT7TR: It runs at 84 MHz and packs 256 KB of Flash and 64K x 8 SRAM in a 64-LQFP package. The Cortex-M4 core includes a single-precision FPU and DSP instructions, which makes it a fit for motor-control loops, sensor fusion, and audio processing where you need real-time math without an external DSP.
If your project needs more headroom for over-the-air update staging or larger lookup tables, the STM32F401 line scales up to 512 KB Flash and 96 KB SRAM in the same 64-pin footprint.
STMicroelectronics lists the STM32F401RCT7TR as Active (current production). The laser etch and date-code trace back to ST's own supply chain.
Peripheral set and I/O — what connects where
The 50 GPIOs serve a rich peripheral set: I²C, SPI, UART/USART with LIN and IrDA support, SDIO for external storage, USB OTG for host/device connectivity, and I²S for audio codecs. There are also 16 channels of 12-bit ADC, a PWM timer, and a watchdog. The brown-out detect and POR eliminate external reset supervisor ICs in many designs. For a sensor hub or a motor drive, this single chip covers the communication, analog, and timing needs without glue logic.