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HCS12 Datasheet(PDF) 109 Page - NXP Semiconductors |
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HCS12 Datasheet(HTML) 109 Page - NXP Semiconductors |
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109 / 126 page  Device User Guide — 9S12KT256DGV1/D V01.09 109 Freescale Semiconductor Figure A-4 Jitter Definitions The relative deviation of tnom is at its maximum for one clock period, and decreases towards zero for larger number of clock periods (N). Defining the jitter as: NOTE: From the evaluation data a formula for tmax= f(N), resp. tmin = f(N) should be derived. Assuming no long term drift of the reference clock, the following will hold This is very important to notice with respect to timers, serial modules where a pre-scaler will eliminate the effect of the jitter to a large extent. 2 3 N-1 N 1 0 tnom tmax1 tmin1 tmaxN tminN JN () max 1 t max N () Nt nom ⋅ --------------------- – 1 t min N () Nt nom ⋅ --------------------- – , = JN () N ∞ → lim 0 = |
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