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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC312XDP512F0MPVR датащи(PDF) 1270 Page - Freescale Semiconductor, Inc |
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SC312XDP512F0MPVR датащи(HTML) 1270 Page - Freescale Semiconductor, Inc |
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1270 / 1348 page  Appendix A Electrical Characteristics MC9S12XDP512 Data Sheet, Rev. 2.21 1272 Freescale Semiconductor 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: For N < 1000, the following equation is a good fit for the maximum jitter: Figure A-5. Maximum Bus Clock Jitter Approximation This is very important to notice with respect to timers, serial modules where a prescaler will eliminate the effect of the jitter to a large extent. JN () max 1 t max N () Nt nom ⋅ ----------------------- – 1 t min N () Nt nom ⋅ ----------------------- – , ⎝⎠ ⎜⎟ ⎛⎞ = JN () j1 N -------- j2 + = 1 5 10 20 N J(N) |
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