I have an 18F4320 with 8mz crystal and a DS1307 RTC, and trying to set=20 up the Library I2C (Not software) to drive the DS1307. In the 18F4320=20 Data sheet, Table 17-3 (I2C Clock with W/BRG) There are FOSC values of=20 40, 16, 10, and 4 mhz., but not 8 mhz. that I have. What value should I=20 use for SSPADD? I am following the example here: http://www.microchip.com/forums/tm.aspx?m=3D515040&high=3DI2C+DS1307. Any other thoughts appreciated too. :) --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .