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LSM6DS0 Datasheet(PDF) 29 Page - STMicroelectronics |
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LSM6DS0 Datasheet(HTML) 29 Page - STMicroelectronics |
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29 / 59 page  DocID025604 Rev 3 29/59 LSM6DS0 Digital interfaces 59 Both the read register and write register commands are completed in 16 clock pulses or in multiples of 8 in case of multiple read/write bytes. Bit duration is the time between two falling edges of SPC. The first bit (bit 0) starts at the first falling edge of SPC after the falling edge of CS while the last bit (bit 15, bit 23, ...) starts at the last falling edge of SPC just before the rising edge of CS. bit 0: RW bit. When 0, the data DI(7:0) is written into the device. When 1, the data DO(7:0) from the device is read. In latter case, the chip will drive SDO at the start of bit 8. bit 1-7: address AD(6:0). This is the address field of the indexed register. bit 8-15: data DI(7:0) (write mode). This is the data that is written into the device (MSb first). bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first). In multiple read/write commands further blocks of 8 clock periods will be added. When the CTRL_REG8 (22h) (IF_ADD_INC) bit is ‘0’, the address used to read/write data remains the same for every block. When the CTRL_REG8 (22h)(IF_ADD_INC) bit is ‘1’, the address used to read/write data is increased at every block. The function and the behavior of SDI and SDO remain unchanged. 4.2.1 SPI read Figure 15. SPI read protocol The SPI read command is performed with 16 clock pulses. A multiple byte read command is performed by adding blocks of 8 clock pulses to the previous one. bit 0: READ bit. The value is 1. bit 1-7: address AD(6:0). This is the address field of the indexed register. bit 8-15: data DO(7:0) (read mode). This is the data that will be read from the device (MSb first). bit 16-... : data DO(...-8). Further data in multiple byte reads. CS SPC SDI SDO RW DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0 AD5 AD4 AD3 AD2 AD1 AD0 AD6 |
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