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MAC7200 Datasheet(PDF) 740 Page - Freescale Semiconductor, Inc |
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MAC7200 Datasheet(HTML) 740 Page - Freescale Semiconductor, Inc |
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740 / 976 page  Functional Description MAC7200 Microcontroller Family Reference Manual, Rev. 2 662 Freescale Semiconductor Figure 31-32. Start Bit Search Example 5 In Figure 31-33, 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 31-33. Start Bit Search Example 6 31.10.5.4 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 flag, FE, in SCI status register 1 (SCISR1). A break character also sets the FE flag because a break character has no stop bit. 31.10.5.5 Baud Rate Tolerance A transmitting device may be operating at a baud rate below or above the receiver baud rate. Accumulated bit time misalignment can cause one of the three stop bit data samples (RT8, RT9, and RT10) to fall outside the actual stop bit.A noise error will occur if the RT8, RT9, and RT10 samples are not all the same logical values. A framing error will occur if the receiver clock is misaligned in such a way that the majority of the RT8, RT9, and RT10 stopbit samples are a logic zero. RESET RT CLOCK SAMPLES RT CLOCK RT CLOCK COUNT START BIT Rx Input Signal 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 Rx Input Signal 11 1 11 0 0 0 LSB 1 1 1 1 0 11 0 |
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