In preparation for the training module to follow, several key acronyms will be defined. RTCC stands for Real-Time Clock/Calendar, which is a common microcontroller peripheral used to keep time and trigger alarms. The DSWDT, or Deep Sleep Watchdog Timer, is a new wake-up source for deep sleep applications. ULPWU, or Ultra Low-Power Wake-Up is a time delayed wake-up source that does not require an oscillator. The DSBOR, or Deep Sleep Brown-Out Reset, is a low-power voltage monitor that prevents the microcontroller from executing if power drops too low for safe operation.