s908ey8ad4cfjer Freescale Semiconductor, Inc, s908ey8ad4cfjer Datasheet - Page 133

• Manufacturer Part Number: s908ey8ad4cfjer
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

To verify the start bit and to detect noise, data recovery logic takes samples at RT3, RT5, and RT7.
Table 13-2
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.
To verify a stop bit and to detect noise, recovery logic takes samples at RT8, RT9, and RT10.
summarizes the results of the stop bit samples.
Freescale Semiconductor
Table 13-3
summarizes the results of the start bit verification samples.
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 1s following a
successful start bit verification, the noise flag (NF) is set and the receiver
assumes that the bit is a start bit.
summarizes the results of the data bit samples.
RT8, RT9, and RT10 Samples
RT3, RT5, and RT7 Samples
RT8, RT9, and RT10 Samples
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
Table 13-2. Start Bit Verification
Table 13-4. Stop Bit Recovery
Table 13-3. Data Bit Recovery
NOTE
Data Bit Determination
Start Bit Verification
Framing Error Flag
Yes
Yes
Yes
Yes
No
No
No
No
0
0
0
1
0
1
1
1
1
1
1
0
1
0
0
0
Noise Flag
Noise Flag
Noise Flag
0
1
1
0
1
0
0
0
0
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0
Functional Description
Table 13-4
133