P912XDP512F0MPVR datasheet(504/1348 Pages) FREESCALE

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Chapter 11 Serial Communication Interface (S12SCIV5)

MC9S12XDP512 Data Sheet, Rev. 2.21

504

Freescale Semiconductor

To determine the value of a data bit and to detect noise, recovery logic takes samples at RT8, RT9, and

RT10. Table 11-17 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 and the receiver

assumes that the bit is a start bit (logic 0).

To verify a stop bit and to detect noise, recovery logic takes samples at RT8, RT9, and RT10. Table 11-18

summarizes the results of the stop bit samples.

Table 11-17. Data Bit Recovery

RT8, RT9, and RT10 Samples

Data Bit Determination

Noise Flag

000

001

010

011

100

101

110

111

Table 11-18. Stop Bit Recovery

RT8, RT9, and RT10 Samples

Framing Error Flag

Noise Flag

000

001

010

011

100

101

110

111

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