MCU	Tested Works	Doesn't Work	Not Tested	Notes
Atmega328 @ 16MHz	X
Atmega328 @ 12MHz	X			For LCD example had to move pin 7.
Atmega32u4 @ 16MHz	X
Atmega32u4 @ 8MHz	X
ESP8266	X
Atmega2560 @ 16MHz	X
ATSAM3X8E	X
ATSAM21D	X
ATtiny85 @ 16MHz		X
ATtiny85 @ 8MHz		X
Intel Curie @ 32MHz			X
STM32F2			X

ATmega328 @ 16MHz : Arduino UNO, Adafruit Pro Trinket 5V, Adafruit Metro 328, Adafruit Metro Mini
ATmega328 @ 12MHz : Adafruit Pro Trinket 3V
ATmega32u4 @ 16MHz : Arduino Leonardo, Arduino Micro, Arduino Yun, Teensy 2.0
ATmega32u4 @ 8MHz : Adafruit Flora, Bluefruit Micro
ESP8266 : Adafruit Huzzah
ATmega2560 @ 16MHz : Arduino Mega
ATSAM3X8E : Arduino Due
ATSAM21D : Arduino Zero, M0 Pro
ATtiny85 @ 16MHz : Adafruit Trinket 5V
ATtiny85 @ 8MHz : Adafruit Gemma, Arduino Gemma, Adafruit Trinket 3V