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DSP56857 Datasheet(PDF) 252 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) 252 Page - Freescale Semiconductor, Inc

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Functional Description
5685X Digital Signal Controller User Manual, Rev. 4
10-16
Freescale Semiconductor
Figure 10-11. Start Bit Search Example 5
Figure 10-12 shows a noise burst makes the majority of data samples RT8, RT9, and RT10 high.
This sets the Noise Flag but does not reset the RT clock. In Start bits only, the RT8, RT9, and
RT10 data samples are ignored.
Figure 10-12. Start Bit Search Example 6
10.6.4.4 Framing Errors
If the data recovery logic does not detect a Logic 1 where the Stop bit should be in an incoming
frame, it sets the Framing Error (FE) flag in the SCI Status Register (SCISR). A break character
also sets the FE flag because a break character has no Stop bit. The FE flag is set at the same time
as the RDRF flag. The FE flag inhibits further data reception until it is cleared.
RESET RT CLOCK
SAMPLES
RT CLOCK
RT CLOCK COUNT
START BIT
RXD
11
1
11
0
1
0
LSB
1
1
1
1
1
00
0
00
0
0
0
NO START BIT FOUND
RESET RT CLOCK
SAMPLES
RT CLOCK
RT CLOCK COUNT
START BIT
RXD
11
1
11
0
0
0
LSB
1
1
1
1
0
11
0



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