The SoC Wireless MCU CC3220x device comes in three variants: CC3220R, CC3220S, and C3220SF. CC3220R features 256KB of RAM, IoT networking security and device identity/keys. CC3220S builds on the CC3220R and MCU level security such as file system encryption, user IP (MCU image) encryption, secure boot and debug security. CC3220SF builds on the CC3220S and integrates a user-dedicated 1MB of executable Flash, in addition to the 256KB of RAM.