H3LIS100DL Datasheet, PDF (20/38 Pages) STMicroelectronics – 8-bit data output

Digital interfaces
H3LIS100DL
5.2
SPI bus interface
The H3LIS100DL SPI is a bus slave. The SPI allows the writing and reading of the device
registers.
The serial interface interacts with the outside world with 4 wires: CS, SPC, SDI and SDO.
Figure 6. Read and write protocol
&6
63&
6',
6'2
5:
', ', ', ', ', ', ', ',
06 $' $' $' $' $' $'
'2 '2 '2 '2 '2 '2 '2 '2
CS is the serial port enable and it is controlled by the SPI master. It goes low at the start of
the transmission and goes back high at the end. SPC is the serial port clock and it is
controlled by the SPI master. It is stopped high when CS is high (no transmission). SDI and
SDO are respectively the serial port data input and output. Those lines are driven at the
falling edge of SPC and should be captured at the rising edge of SPC.
Both the read register and write register commands are completed in 16 clock pulses or in
multiples of 8 in the 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 the latter case, the chip drives SDO at the start of bit 8.
bit 1: MS bit. When 0, the address remains unchanged in multiple read/write commands.
When 1, the address is auto-incremented in multiple read/write commands.
bit 2-7: address AD(5:0). 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 are added. When the MS
bit is ‘0’, the address used to read/write data remains the same for every block. When the
MS 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.
20/38
DocID027504 Rev 2