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L99H01 데이터시트(PDF) 36 Page - STMicroelectronics

부품명 L99H01
상세설명  Motor bridge driver for automotive applications
PDF  53 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99H01 데이터시트(HTML) 36 Page - STMicroelectronics

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Functional description of the SPI
L99H01
36/53
DocID15567 Rev 6
4.4.1
SPI clock monitor and watchdog
Figure 11. Global error flag diagram
1.
Writing a “1” to RWD - bit in ApplRegx restarts the internal watchdog counter.
The clock monitor counts the number of clock pulses during a communication frame (while
CSN is low). If the number of SCK pulses does not correspond with the frame width
indicated in the <SPI-frame-ID> (ROM address 03hex) the frame is ignored and the bit
<frame error> in the <Global Status Byte> is set.
Note:
Due to this safety functionality, daisy chaining the SPI is not possible. Instead, a parallel
operation of the SPI bus by controlling the CSN signal of the connected ICs is
recommended.



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