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PC912XDP512F0MPVR 데이터시트(PDF) 506 Page - Freescale Semiconductor, Inc

부품명 PC912XDP512F0MPVR
상세설명  HCS12X Microcontrollers
PDF  1348 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC912XDP512F0MPVR 데이터시트(HTML) 506 Page - Freescale Semiconductor, Inc

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Chapter 11 Serial Communication Interface (S12SCIV5)
MC9S12XDP512 Data Sheet, Rev. 2.21
506
Freescale Semiconductor
In Figure 11-24, a large burst of noise is perceived as the beginning of a start bit, although the test sample
at RT5 is high. The RT5 sample sets the noise flag. Although this is a worst-case misalignment of perceived
bit time, the data samples RT8, RT9, and RT10 are within the bit time and data recovery is successful.
Figure 11-24. Start Bit Search Example 3
Figure 11-25 shows the effect of noise early in the start bit time. Although this noise does not affect proper
synchronization with the start bit time, it does set the noise flag.
Figure 11-25. Start Bit Search Example 4
Reset RT Clock
Samples
RT Clock
RT Clock Count
Actual Start Bit
RXD
10
1
11
0
0
0
0
LSB
0
Perceived Start Bit
Reset RT Clock
Samples
RT Clock
RT Clock Count
Perceived and Actual Start Bit
RXD
11
1
11
0
0
1
LSB
1
1
1
1



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