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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FXLS8974CF датащи(PDF) 17 Page - NXP Semiconductors |
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FXLS8974CF датащи(HTML) 17 Page - NXP Semiconductors |
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17 / 96 page  NXP Semiconductors FXLS8974CF 3-Axis Low-g Accelerometer second byte of 0s or 1s (don't care condition) transfers. After this transfer completes, the next 8 SCLK cycles (pulses 17 through 24) output the selected register content on the SPI_MISO line in MSB first order. Figure 8 shows the bus protocol for a single-byte read operation. aaa-040840 A6 A5 A4 A3 A2 R/W A1 A0 X High-Impedance SPI_MISO SPI_MOSI SCLK SPI_CS_B X X X X X X X X X X X X X X X X 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 D7 D6 D5 D4 D3 D2 D1 D0 D7 Figure 8. SPI single-byte read protocol diagram (4-wire mode), R/W = 1 Multiple-byte read operations are performed similarly to single-byte reads with additional bytes read out in multiples of eight SCLK cycles. FXLS8974CF auto-increments the register read address so that every eighth clock edge latches the address of the next sequential register read address. When the desired number of bytes has been read, a rising edge on SPI_CS_B terminates the transaction. aaa-040841 High-Impedance SPI_MISO SPI_MOSI SCLK SPI_CS_B A6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 A5 A4 A3 A2 R/W A1 A0 X X X X X X X X X X D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 X X X X X X X X X X X X X X X Figure 9. SPI multiple-byte read protocol diagram (4-wire mode), R/W = 1 13.4 SPI read operations with 3-wire mode FXLS8974CF can be configured to operate in 3-wire software enabled SPI mode. In this mode, the SPI_MISO pin is left unconnected and the SPI_MOSI pin becomes a bidirectional input/output pin (SPI_DATA). Read operations in 3-wire mode are the same as write operations in 3- and 4-wire modes, except that at the end of the address cycle (falling edge of clock pulse 16), the SPI_DATA pin automatically switches from an input to an output and with bit D7 as the current output state. aaa-040842 A6 A5 A4 A3 A2 R/W A1 A0 X High-Impedance SPI_MISO SPI_DATA SCLK SPI_CS_B X X X X X X X 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 D7 D6 D5 D4 D3 D2 D1 D0 D7 Figure 10. SPI single-byte read protocol diagram (3-wire mode) FXLS8974CF All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Objective data sheet Rev. 1 — 27 April 2021 17 / 96 |
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