I thought the allowable % error for the baud rate was worked out from
how far out the clock can be out after all the bits have been clocked
in. Can anyone point to a document on the web that explains this?

Second question:  On page 9-98 of the 1996/1997 PIC 16/17
Microcontroller data book in table 12-4 they give a table of various
crystals and the % error for baud rate using the USART.  None of the
crystals give exact baud rates.  I chose a crystal based on this
table thinking it would be one of the crystals giving the most
accurate baud rate (I chose 3.579545MHz giving errors of -2.9% for
9600 and 19200 baud).  Why does the book have those crystals when the
crystals mentioned by contributors to the list, eg 3.6864MHz give
exact bald rates?


Paul Gaastra                              pgaastra@hort.cri.nz
Technology Development Group, Hort Research
Private Bag 3123              fax +64 7 8584705
Hamilton, NEW ZEALAND       phone +64 7 8584745