Adafruit-PN532

Compatibility

MCU	Tested Works	Doesn't Work	Not Tested	Notes
Atmega328 @ 16MHz	X			SPI & I2C Works
Atmega328 @ 12MHz	X			SPI & I2C Works
Atmega32u4 @ 16MHz	X			Follow instructions at https://learn.adafruit.com/adafruit-pn532-rfid-nfc/shield-wiring#using-with-the-arduino-leonardo-and-yun to move pin 2.
Atmega32u4 @ 8MHz	X			SPI & I2C Works
ESP8266		X		SPI only, I2C clock stretching not supported
ESP32	X			SPI works; I2C works using IRQ and without sharing the I2C bus.
Atmega2560 @ 16MHz	X			SPI & I2C Works
ATSAM3X8E	X			SPI & I2C Works
ATSAM21D		X		SPI only, I2C clock stretching not supported. Use programming port.
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
ESP32 : WROOM
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