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STR720 bảng dữ liệu(PDF) 255 Page - STMicroelectronics

tên linh kiện STR720
Giải thích chi tiết về linh kiện  ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STR720 bảng dữ liệu(HTML) 255 Page - STMicroelectronics

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The examples in Figure 38 show how short dominant noise spikes are filtered by
synchronizations. In both examples the spike starts at the end of Prop_Seg and has the
length of “Prop_Seg + Phase_Seg1”.
In the first example, the Synchronization Jump Width is greater than or equal to the phase
error of the spike’s edge from recessive to dominant. Therefore the Sample Point is shifted
after the end of the spike; a recessive bus level is sampled.
In the second example, SJW is shorter than the phase error, so the Sample Point cannot be
shifted far enough; the dominant spike is sampled as actual bus level.
Figure 38. Filtering of Short Dominant Spikes
recessive
dominant
Sync_Seg
Prop_Seg
Phase_Seg1
Phase_Seg2
Spike
Rx-Input
Sample-Point
Sample-Point
Sample-Point
Sample-Point
recessive
dominant
Spike
Rx-Input
SJW
≥ Phase Error
SJW < Phase Error
1



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