MC68HC08AZ0 Datasheet, PDF (194/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Serial Communications Interface Module (SCI)
Table 5. Data bit recovery
RT8, RT9, and RT10 Samples
000
001
010
011
100
101
110
111
Data bit determination
0
0
0
1
0
1
1
1
Noise flag
0
1
1
1
1
1
1
0
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 ‘1’s following
a successful start bit verification, the noise flag (NF) is set and the
receiver assumes that the bit is a start bit.
To verify a stop bit and to detect noise, recovery logic takes samples
at RT8, RT9, and RT10. Table 6 summarizes the results of the stop
bit samples.
Table 6. Stop bit recovery
RT8, RT9, and RT10 samples
000
001
010
011
100
101
110
111
Framing error flag
1
1
1
0
1
0
0
0
noise flag
0
1
1
1
1
1
1
0
MC68HC08AZ0
192
Serial Communications Interface Module (SCI)
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