Freescale Semiconductor MPC5565, Reference Manual

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Enhanced Serial Communication Interface (eSCI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
20-28 Freescale Semiconductor
To determine the value of a data bit and to detect noise, eSCI recovery logic takes samples at RT8, RT9,
and RT10.
Table 20-19 summarizes the results of the data bit samples.
NOTE
The RT8, RT9, and RT10 samples do not affect start bit verification. If any
or all of the RT8, RT9, and RT10 start bit samples are logic 1s following a
successful start bit verification, the noise flag (NF) is set.
To verify a stop bit and to detect noise, recovery logic takes samples at RT8, RT9, and RT10. Table 20-20
summarizes the results of the stop bit samples.
Table 20-19. 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
Table 20-20. 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