Does anyone know the width of the SPI clock pulse
generated by the PIC MSSP module?  Is it "fixed"
or does it vary (by device type, MSSP initialization
parameters, clock rate, etc.)?  I could not find this
in the 16F877 (for example) datasheet or the midrange
manual.

    I don't have a scope to measure it, but I did
measure it using TMR1 on a PIC16F877 (4MHz resonator)
running under an ICD. I came up with 11-13 usec
(it depends on where in the loop the clock
transitions).

   I am looking to write an SPI slave in firmware, so
I assume I need to know the pulse width.  My
understanding is that SPI data is valid during the
pulse (at least when clock polarity is low and clock
phase is "zero").  I want to write this in C so
I want to make sure I can process the data in the
available time.


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