512 KB Flash, 96 KB SRAM — sizing the firmware image and heap
Program memory is 512 KB of Flash, organised as 512 K x 8, with the usual STM32F4 sector layout (four 16 KB sectors, one 64 KB, and seven 128 KB sectors). The 96 KB SRAM splits between a main 64 KB block and a 32 KB CCM (core-coupled memory) accessible only by the CPU — no DMA. That CCM region is ideal for interrupt stacks or time-critical loops, but watch the linker script: placing a DMA buffer there will silently fail.
USB OTG, 81 I/O, and the peripheral mix
Connectivity includes USB OTG (full-speed), three SPI, three I²C, six UART/USART, SDIO, and I²S — enough for a sensor hub or a small HMI panel. Brown-out detect, POR, and a windowed watchdog are on-chip, so external supervisor ICs are optional for most industrial designs.
For procurement, this means the part is factory-supported and can be specified into production without near-term obsolescence risk.