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DSP56857 Datasheet(PDF) 250 Page - Freescale Semiconductor, Inc

Part # DSP56857
Description  Digitial Signal Controller
PDF  662 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56857 Datasheet(HTML) 250 Page - Freescale Semiconductor, Inc

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Functional Description
5685X Digital Signal Controller User Manual, Rev. 4
10-14
Freescale Semiconductor
Figure 10-7. Start Bit Search Example 1
Figure 10-8 shows noise is perceived as the beginning of a Start bit although the verification
sample at RT3 is high. The RT3 sample sets the Noise Flag. Although the perceived bit time is
misaligned, the data samples RT8, RT9, and RT10 are within the bit time and data recovery is
successful.
Figure 10-8. Start Bit Search Example 2
Figure 10-9 illustrates a large burst of noise is perceived as the beginning of a Start bit, although
the test sample at RT5 is high. The RT5 sample sets the Noise Flag. Although this is a worst-case
misalignment of perceived bit time, the data samples RT8, RT9, and RT10 are within the bit time
and data recovery is successful.
RESET RT CLOCK
SAMPLES
RT CLOCK
RT CLOCK COUNT
START BIT
RXD
11
0
1
11
1
0
0
0
00
LSB
0
0
RESET RT CLOCK
SAMPLES
RT CLOCK
RT CLOCK COUNT
ACTUAL START BIT
RXD
11
1
1
11
0
0
0
0
LSB
0
0
PERCEIVED START BIT



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