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DSP56857 Datasheet(PDF) 251 Page - Freescale Semiconductor, Inc |
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DSP56857 Datasheet(HTML) 251 Page - Freescale Semiconductor, Inc |
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251 / 662 page  Functional Description Serial Communications Interface (SCI), Rev. 4 Freescale Semiconductor 10-15 Figure 10-9. Start Bit Search Example 3 Figure 10-10 illustrates the effect of noise early in the Start bit time. Although this noise does not affect proper synchronization with the Start bit time, it does set the Noise Flag. Figure 10-10. Start Bit Search Example 4 Figure 10-11 demonstrates a burst of noise near the beginning of the Start bit that resets the RT clock. The sample after the reset is low but is not preceded by three high samples that would qualify as a falling edge. Depending on the timing of the Start bit search and on the data, the frame may be missed entirely or it may set the framing error flag. RESET RT CLOCK SAMPLES RT CLOCK RT CLOCK COUNT ACTUAL START BIT RXD 10 1 11 0 0 0 0 LSB 0 PERCEIVED START BIT RESET RT CLOCK SAMPLES RT CLOCK RT CLOCK COUNT PERCEIVED AND ACTUAL START BIT RXD 11 1 11 0 0 1 LSB 1 1 1 1 |
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