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NRF9160-SICA-R7 bảng dữ liệu(PDF) 294 Page - Nordic Semiconductor

tên linh kiện NRF9160-SICA-R7
Giải thích chi tiết về linh kiện  nRF9160 Product Specification
PDF  400 Pages
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nhà sản xuất  NORDIC [Nordic Semiconductor]
Trang chủ  https://www.nordicsemi.com/
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NRF9160-SICA-R7 bảng dữ liệu(HTML) 294 Page - Nordic Semiconductor

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Peripherals
The TWI master cannot be stopped while suspended, so the STOP task must be issued after the TWI
master has been resumed.
1
3
2
ADDR
0
M-1
M
2
4
Stretch
1
Figure 92: The TWI master reading data from a slave
6.17.5 Master repeated start sequence
A typical repeated start sequence is one in which the TWI master writes two bytes to the slave followed by
reading four bytes from the slave. This example uses shortcuts to perform the simplest type of repeated
start sequence, i.e. one write followed by one read. The same approach can be used to perform a
repeated start sequence where the sequence is read followed by write.
The following figure shows an example of a repeated start sequence where the TWI master writes two
bytes followed by reading four bytes from the slave.
1
ADDR
0
3
2
ADDR
0
1
1
2
Figure 93: Master repeated start sequence
If a more complex repeated start sequence is needed, and the TWI firmware drive is serviced in a low
priority interrupt, it may be necessary to use the SUSPEND task and SUSPENDED event to guarantee that
the correct tasks are generated at the correct time. A double repeated start sequence using the SUSPEND
task to secure safe operation in low priority interrupts is shown in the following figure.
4418_1315 v2.0
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