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DSP56857 bảng dữ liệu(PDF) 251 Page - Freescale Semiconductor, Inc

tên linh kiện DSP56857
Giải thích chi tiết về linh kiện  Digitial Signal Controller
PDF  662 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56857 bảng dữ liệu(HTML) 251 Page - Freescale Semiconductor, Inc

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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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