mc68hc908gp20 Freescale Semiconductor, Inc, mc68hc908gp20 Datasheet - Page 261

• Manufacturer Part Number: mc68hc908gp20
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908GP20
Freescale Semiconductor
—
Rev 2.1
To verify the start bit and to detect noise, data recovery logic takes
samples at RT3, RT5, and RT7.
the start bit verification samples.
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
RT3, RT5, and RT7
Samples
Samples
000
001
010
011
100
101
110
111
Table 18-2. Start Bit Verification
000
001
010
011
100
101
110
111
Table 18-3. Data Bit Recovery
Table 18-2
Determination
Verification
Start Bit
Data Bit
Yes
Yes
Yes
Yes
No
No
No
No
Table 18-3
0
0
0
1
0
1
1
1
summarizes the results of
Noise Flag
Noise Flag
summarizes the
Advance Information
0
1
1
0
1
0
0
0
0
1
1
1
1
1
1
0
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