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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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DSP56857 데이터시트(PDF) 252 Page - Freescale Semiconductor, Inc |
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DSP56857 데이터시트(HTML) 252 Page - Freescale Semiconductor, Inc |
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252 / 662 page  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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