I think it may also be done to avoid trapping water soluble flux under the
parts. Inadequate cleaning of water soluble flux causes lots of problems.
I've had it hold an SPI clock line low so the PIC gets stuck the first
time it tries to output SPI. The PIC counts the clock pulses on the pin
itself, not on the input to the driver, so if the line is stuck, the
pulses do not get counted. I suspect this wiring is so the PIC can be
either the SPI master or slave. I remember using water soluble spacers on
leads to hold components up away from the board, then washing the board.

Harold



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