MC68HC08AZ16 Datasheet, PDF (183/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

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
MC68HC08AZ32
182
Serial Communications Interface Module (SCI)
14-sci
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