i got the datasheet here: http://pdfserv.maxim-ic.com/en/ds/DS1307.pdf
under the "Slave Receiver Mode (Write Mode)" section of page 11
also on page 12 the data diagram shws a word address.
this is highly confusing.
Snood
edit: equaly it says: The DS1307 operates as a slave device on the I2C bus. Access is obtained by implementing a START
condition and providing a device identification code followed by a register address.
not "serial" but "i2c"
are you looking at an old version maybe?




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