Before you ask… No, it’s not another one of those CNXSoft’s typos, I did not mean to write cm (centimeters), and HDSC HC32L110 is indeed an Arm Cortex-M0+ microcontroller available in an almost microscopic 1.59 x 1.436 mm CSP16 package, which could make it the world’s smallest Arm MCU. Clock, crystal oscillators External high-speed crystal oscillator 4 ~ 32MHz External low-speed crystal oscillator 32.768KHz Internal high-speed clock 4/8/16/22.12/24MHz Internal low-speed clock 32.8/38.4KHz Watchdog timer Hardware supports internal and external clock calibration and monitoring Power consumption 0.5μA @ 3V in deep sleep mode (all clocks off, power-on reset valid, IO status maintained, IO interrupt valid) 1.0μA @ 3V in deep sleep mode + RTC operation 6μA in 32.768KHz low-speed active mode…