At 10:05 PM 7/22/96 -0400, you wrote:
>>Forgive the question but isn't an ECS-40-s-4 a series crystal and the
preferred
>>type is parallel? Some of the books list a series crystal as tested but still
>>say you need parallel.
>>
>
>What book is it that says you need parallel?  I don't know enough about it.
>If anyone has further recommendations as to the clock circuit, I would be
>much obliged.
>
>Brad
>_____________________________________________________________________
>Brad Pousland                           http://mole.uvm.edu/~bpouslan
>Computing and Information Technologies  bpouslan@mole.uvm.edu
>University of Vermont                   656-2604
>
Well for one spot its in the PIC 16C84 data book section 8.2.2
The PIC16C84 oscillator design requires the use of a parallel cut crystal.
Use of a series cut crystal my give a frequency out of the crystal
manufacturers specifications.

The PIC16C7X book says that true for all 16CXX oscillators in section 14.2.2

The odd thing is after saying that in a PIC16C84 data book table 8-2
the list the series crystal you were talking about the ECS ECS-40-S-4 as
being one of the crystals tested. I wish someone at Microchip would
say either that the ECS series parts test do work or someone make a mistake
and should have used the parallel part numbers in the chart.

I will use the parallel parts from now on, my first design was using the
same crystal as discussed about and it was 4% off freq.