Arduino RTC8564 Library ( I2C master library version )

RTC8564_I2C library, originally by okhiroyuki. See https://github.com/okhiroyuki/RTC8564_I2C

RTC8564 library ( Wire library version ), originally by en_daisuke. See http://projectsbiotope.blogspot.jp/2011/03/arduino-1.html

This Library must import Arduino I2C master library. See http://dsscircuits.com/articles/arduino-i2c-master-library.html or https://github.com/rambo/I2C