Josh Koffman wrote:
> 1. Is it usual to use a pull up or pull down on the serial lines (CS,
> SCLK and DIN)?

No, mostly.  The clock, slave selects, and data output from master lines are
always driven.  A pulldown or pullup resistor would only matter for a brief
time during system power up or when the PIC is programmed in circuit.
Usually the issue can be ignored during this time.

The data into master lines may not always be driven, and a pulldown on them
makes sense in that case.  You need a resistor just low enough to keep the
line from floating when it's not driven, like 100Kohms.


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