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AS5247 Datasheet(PDF) 11 Page - ams AG |
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AS5247 Datasheet(HTML) 11 Page - ams AG |
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11 / 37 page  ams Datasheet: 2014-Jun-20 [v1-02] AS5247 – 11 Detaile d Desc rip t ion SPI Interface (slave) The SPI interface is used by a host microcontroller (master) to read or write the volatile memory as well as to program the non-volatile OTP registers. The AS5247 SPI only supports slave operation mode. It communicates at clock rates up to 10 MHz. The AS5247 SPI uses mode=1 (CPOL=0, CPHA=1) to exchange data. As shown in Figure 12, a data transfer starts with the falling edge of CSn (SCL is low). The AS5247 samples MOSI data on the falling edge of SCL. SPI commands are executed at the end of the frame (rising edge of CSn). The bit order is MSB first. Data is protected by parity. SPI Timing The AS5247 SPI timing is shown in Figure 12. Figure 12: SPI Timing Diagram CSn (Input) CLK (Input) MOSI (Input) MISO (Output) tclk tL tMOSI tMISO tOZ tOZ tH tCSn tclkL tclkH Data[15] Data[15] Data[14] Data[14] Data[0] Data[0] |
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