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MC68HC908AB32
Rev. 1.0
—
MOTOROLA
To verify the start bit and to detect noise, data recovery logic takes
samples at RT3, RT5, and RT7.
the start bit verification samples.
Table 15-2. Start Bit Verification
RT3, RT5, and RT7
Samples
000
001
010
011
100
101
110
111
Start bit verification is not successful if any two of the three verification
samples are logic 1s. 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.
results of the data bit samples.
RT8, RT9, and RT10
Samples
000
001
010
011
100
101
110
111
Serial Communications Interface Module (SCI)
Serial Communications Interface Module (SCI)
Table 15-2
Start Bit
Verification
Yes
Yes
Yes
No
Yes
No
No
No
Table 15-3. Data Bit Recovery
Data Bit
Determination
Functional Description
summarizes the results of
Noise Flag
0
1
1
0
1
0
0
0
Table 15-3
summarizes the
Noise Flag
0
0
0
1
0
1
1
1
0
1
1
1
1
1
1
0
Technical Data
253
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