The STMicroelectronics Microcontroller devices embed high speed memories up to 512 Kbyte flash memory and 274 Kbyte SRAM, one Octo SPI flash memory interface, an extensive range of enhanced I/Os, peripherals connected to three APB buses, three AHB buses and a 32 bit multi AHB bus matrix.

1 Octo SPI memory interface
HASH hardware accelerator
4 Kbyte data cache for external memories
4 to 50 MHz crystal oscillator
1 ultra low power comparator
Internal 48 MHz with clock recovery