The interface is full duplex, allowing the device to be read from and written to within the same data frame. The length of the individual device words is programmable through the state of the M1 pin. This pin must be set to one of three states at power-up. The pin state is latched at power-up and changing the pin state after power-up has no effect. Table 7 lists the modes associated with the M1 pin state. The M1 pin must be tied high to IOVDD through a < 1-kΩ resistor, low to GND through a < 1-kΩ resistor, or left floating.
|M1 STATE||DEVICE WORD LENGTH (Bits)|