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PC312XDP512F0CFVR Datasheet(PDF) 504 Page - Freescale Semiconductor, Inc

Part # PC312XDP512F0CFVR
Description  HCS12X Microcontrollers
PDF  1348 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC312XDP512F0CFVR Datasheet(HTML) 504 Page - Freescale Semiconductor, Inc

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Chapter 11 Serial Communication Interface (S12SCIV5)
MC9S12XDP512 Data Sheet, Rev. 2.21
504
Freescale Semiconductor
To determine the value of a data bit and to detect noise, recovery logic takes samples at RT8, RT9, and
RT10. Table 11-17 summarizes the results of the data bit samples.
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 logic 1s following a
successful start bit verification, the noise flag (NF) is set and the receiver
assumes that the bit is a start bit (logic 0).
To verify a stop bit and to detect noise, recovery logic takes samples at RT8, RT9, and RT10. Table 11-18
summarizes the results of the stop bit samples.
Table 11-17. Data Bit Recovery
RT8, RT9, and RT10 Samples
Data Bit Determination
Noise Flag
000
0
0
001
0
1
010
0
1
011
1
1
100
0
1
101
1
1
110
1
1
111
1
0
Table 11-18. Stop Bit Recovery
RT8, RT9, and RT10 Samples
Framing Error Flag
Noise Flag
000
1
0
001
1
1
010
1
1
011
0
1
100
1
1
101
0
1
110
0
1
111
0
0



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