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1 Table of contents.................................................................................................................32 Purpose of this Application Note..........................................................................................43 Intel Mode...........................................................................................................................53.1 Important Notice ...........................................................................................................53.2 Working variants ...........................................................................................................53.2.1 Master transmitter with typical timing......................................................................53.2.2 Master transmitter with long chip select.................................................................53.2.3 Master transmitter with long CS and long WR ........................................................63.2.4 Master receiver with typical timing ..........................................................................63.2.5 Master receiver with long CS and long RD Critical ! ..............................................63.2.6 Master receiver with very long CS ..........................................................................73.2.7 Master receiver mode with very long RD Critical ! ................................................73.2.8 Master receiver mode with repeated start and write after read ...............................83.3 Motorola access sequence in Intel mode ......................................................................93.3.1 WR low before CS low............................................................................................93.3.2 WR low after CS low Illegal ! ................................................................................93.3.3 CS shorter than, and within WR Not working !.....................................................104 Motorola Mode...................................................................................................................114.1 Access sequences which work under limited circumstances.......................................114.1.1 Write access timing Critical ! ...............................................................................114.1.2 Master receiver, very long read cycle Critical !.....................................................114.1.3 Falling CS before R/W Illegal ! ...........................................................................124.1.4 R/W high before CS high......................................................................................124.1.5 R/W shorter than CS and within CS low period Illegal ! ......................................125 Reset................................................................................................................................136 Good to know ....................................................................................................................136.1 Detection of I2C bus traffic ..........................................................................................136.2 Not detected start in slave mode.................................................................................136.3 Live insertion of hardware ...........................................................................................146.4 Statusregister S1 ........................................................................................................146.5 PCF8584 in systems with micros with on board I2C ....................................................147 Multimaster systems..........................................................................................................147.1 Power up in Multimaster systems................................................................................157.2 Lost arbitration ............................................................................................................157.3 Lost arbitration with general call- or own- address ......................................................168 Appendix ...........................................................................................................................178.1 Recommended literature.............................................................................................178.2 Distribution..................................................................................................................17
