Thanks for the replies, and that's Olin too. I should have known to work=20
backwards and figure out the formula. The 13h looks like it fits the=20
pattern. Must just be me or something. I had no problems figuring out=20
the RS-232 serial port bit, and the give a formula there, maybe should=20
have looked there for a hint. Thanks again. :)

On 2/20/2011 2:30 PM, Oli Glaser wrote:
> On 20/02/2011 18:34, Carl Denk wrote:
>   =20
>> I have an 18F4320 with 8mz crystal and a DS1307 RTC, and trying to set
>> up the Library I2C (Not software) to drive the DS1307. In the 18F4320
>> Data sheet, Table 17-3 (I2C Clock with W/BRG) There are FOSC values of
>> 40, 16, 10, and 4 mhz., but not 8 mhz. that I have. What value should I
>> 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
> Looking at the tables and comparing the values, it looks like the
> formula is Fcy / (BRG + 1)
> So for 100 kHz @ Fosc 8MHz it would be 2MHz / (19 + 1) =3D 100 kHz. (19 i=
s
> in decimal =3D 0x13 for hex)
> (Fcy is instruction cycles =3D Fosc / 4)
>
>   =20
--=20
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