RE46C800SS20 is a secure microcontroller from Microchip with on-chip memory. It is based on a 32-bit ARM Cortex-M3 and offers an ultra-low power operation, making it ideal for cost- and space-constrained applications. The secure microcontroller has 8 KB of flash memory and 20 KB of SRAM, plus a variety of peripherals and built-in cyber security features. It is designed for secure access and authentication applications such as secure door locks, ID cards, and secure payments and transactions.