Memory Protection Unit: Mbed supports configuring the MPU on this device to disable writing to ROM and executing from RAM.
Flash IAP: Driver allowing In-Application Programming (IAP) of the MCU flash memory.
RTC: Real-Time Clock. Clock which keeps track of real world time, usually using a low frequency, accurate clock.
True Random Number Generator: Cryptographic-grade True Random Number Generator (TRNG). This is required to implement SSL communications securely unless you provision devices with an entropy seed stored in nonvolatile storage.