MMC2107 - Freescale Semiconductor

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Freescale Semiconductor, Inc. Serial Communications Interface Modules (SCI1 and SCI2) To verify the start bit and to detect noise, data recovery logic takes samples at RT3, RT5, and RT7. Table 16-6. Start Bit Verification nc... Freescale Semiconductor, I RT3, RT5, and RT7 Samples Start Bit Verification Noise Flag 000 Yes 0 001 Yes 1 010 Yes 1 011 No 0 100 Yes 1 101 No 0 110 No 0 111 No 0 If start bit verification is not successful, the RT clock is reset and a new search for a start bit begins. To determine the value of a data bit and to detect noise, recovery logic takes samples at RT8, RT9, and RT10. Table 16-7. Data Bit Recovery RT8, RT9, and RT10 Samples Data Bit Determination Noise Flag 000 0 0 001 0 1 010 0 1 011 1 1 100 0 1 101 1 1 110 1 1 111 1 0 NOTE: The RT8, RT9, and RT10 data samples do not affect start bit verification. If any or all of the RT8, RT9, and RT10 samples are logic 1s following a successful start bit verification, the NF flag is set and the receiver interprets the bit as a start bit (logic 0). Technical Data MMC2107 – Rev. 2.0 358 Serial Communications Interface Modules (SCI1 and SCI2) MOTOROLA For More Information On This Product, Go to: www.freescale.com
Freescale Semiconductor, Inc. Serial Communications Interface Modules (SCI1 and SCI2) Receiver The RT8, RT9, and RT10 samples also verify stop bits. nc... Freescale Semiconductor, I RXD SAMPLES RT CLOCK Table 16-8. Stop Bit Recovery RT8, RT9, and RT10 Samples Framing Error Flag Noise Flag 000 1 0 001 1 1 010 1 1 011 0 1 100 1 1 101 0 1 110 0 1 111 0 0 In Figure 16-17, the verification samples RT3 and RT5 determine that the first low detected was noise and not the beginning of a start bit. The RT clock is reset and the start bit search begins again. The NF flag is not set because the noise occurred before the start bit was verified. START BIT 1 1 1 0 1 1 1 0 0 0 0 0 0 0 LSB RT CLOCK COUNT RT1 RT1 RT1 RT1 RT2 RT3 RT4 RT5 RT1 RT1 RT2 RT3 RT4 RT5 RT6 RT7 RT8 RT9 RT10 RT11 RT12 RT13 RT14 RT15 RT16 RT1 RT2 RT3 RESET RT CLOCK Figure 16-17. Start Bit Search Example 1 MMC2107 – Rev. 2.0 Technical Data MOTOROLA Serial Communications Interface Modules (SCI1 and SCI2) 359 For More Information On This Product, Go to: www.freescale.com
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