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PC312XDP512F0CFVR bảng dữ liệu(PDF) 505 Page - Freescale Semiconductor, Inc

tên linh kiện PC312XDP512F0CFVR
Giải thích chi tiết về linh kiện  HCS12X Microcontrollers
PDF  1348 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC312XDP512F0CFVR bảng dữ liệu(HTML) 505 Page - Freescale Semiconductor, Inc

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Chapter 11 Serial Communication Interface (S12SCIV5)
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
505
In Figure 11-22 the verification samples RT3 and RT5 determine that the first low detected was noise and
not the beginning of a start bit. The RT clock is reset and the start bit search begins again. The noise flag
is not set because the noise occurred before the start bit was found.
Figure 11-22. Start Bit Search Example 1
In Figure 11-23, verification sample at RT3 is high. The RT3 sample sets the noise flag. Although the
perceived bit time is misaligned, the data samples RT8, RT9, and RT10 are within the bit time and data
recovery is successful.
Figure 11-23. Start Bit Search Example 2
Reset RT Clock
Samples
RT Clock
RT Clock Count
Start Bit
RXD
11
0
1
11
1
0
0
0
00
LSB
0
0
Reset RT Clock
Samples
RT Clock
RT Clock Count
Actual Start Bit
RXD
11
1
1
11
0
0
0
0
LSB
0
0
Perceived Start Bit



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