Search results
The SPI allows serial communication with other SPI devices through a 3-pinor 4-pinmode interface. The device implementation supports multichip-selectoperation for up to two SPI slave devices.
data sheet for the clock frequency specification of the SPI interface. SPI interfaces can have only one master and can have one or multiple slaves. Figure 1 shows the SPI connection between the master and the slave.
Please refer to the device data sheet to determine the number of data bits transmitted using the SPI interface. Clock Polarity and Clock Phase. In SPI, the main can select the clock polarity and clock phase. The CPOL bit sets the polarity of the clock signal during the idle state.
The SPI interface provides the user with flexibility to select the rising or falling edge of the clock to sample and/or shift the data. Please refer to the device data sheet to determine the number of data bits transmitted using the SPI interface. In SPI, the main can select the clock polarity and clock phase.
SPI interface is reinitialized upon wakeup from ULP Sleep. SPI modes. There are 4 SPI modes as shown in the below table. SPI Mode Clock Polarity (CPOL)
The SPI module has two means to be placed in a low-power mode: a global low-power mode from the system and a local low-power mode via the POWERDOWN bit (SPICTRL2.2). The net effect on the SPI is the same, independent of the source. A low-power mode in effect shuts down all the clocks to the module.
SPI Timing Diagram Example. The mode depends on the SCLK level, sometimes called polarity (CPOL), when the transmission is initiated (CS is pulled low) and the sampling edge, called phase (CPHA), as shown in Figure 3. Note that the phase is relative to the polarity and is not an absolute value.
