Watchdog: Peripheral which resets the chip if software doesn't service it within a configurable amount of time. Used to guard against software hangs.
Low-Precision Ticker: Also known as the Low-Power Ticker, this peripheral keeps time at a low-frequency clock (usually 32kHz) and generates events for the application. Usually it is used to implement low power sleep.
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.
Serial (UART): Support for buffered and unbuffered serial (UART) ports
Async SPI: Allows use of SPI controller mode in the background via interrupts and/or DMA.
RTC: Real-Time Clock. Clock which keeps track of real world time, usually using a low frequency, accurate clock.
GPIO Port Output: Driver for writing to an entire GPIO port at a time
Memory Protection Unit: Mbed supports configuring the MPU on this device to disable writing to ROM and executing from RAM.
Serial RTS/CTS Flow Control: Serial (UART) peripheral supports using RTS and/or CTS pins for hardware flow control.
