Designs  Programming 
The Timer PreLoad register R21 specifies the minimum number of signal cycles to count and ranges from 1 to 256 (0). The Frequency Prescale register R22 multiplies the cycle count according to:
The number of cycles "
where the factor of 2 accounts for the fact that Spock divides all frequencies it sees by 2 before passing them on to the PIC, regardless of the input selected.

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