On 21/02/2011 14:42, Carl Denk wrote: > Thanks for the clarification, and confirmation that there is not an > explicit formula.:) Actually, apparently there is (check out Michael R-J's post) in section=20 17.4.2 (page 168) Slightly different from the formula I (and Olin) posted in that it uses=20 Fosc rather than Fcy, but obviously the result is the same for either=20 version. (by the way I just noticed I put BRG instead of SSPADD in the=20 formula I posted, just in case that may have confused matters I meant=20 SSPADD (BRG value) ) --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .