Has anyone used the MK41T56 clock on the I2C bus? I am not having any success in getting it to work: 1 ) the ST bit (bit7 of seconds register) - should it be set or cleared to use (the data sheet does not mention it) 2) The address after the 1101000X signature - is it a byte or word address? Any help would be gratefully received ! Many thanks Stephen H Alsop, S&S Systems Ltd, UK. Tel: 01909 773399 steve@s.ssystems.easynet.co.uk - http://easyweb.easynet.co.uk/~s.ssystems