The PAR/SER/BYTE SEL pin is a digital input pin that selects between the parallel or serial or parallel byte interface for reading the data output from the device. If this pin is tied to logic low, then the device operates in the parallel interface mode (see the Parallel Data Read section). If this pin is tied to logic high, then the serial or parallel byte interface mode is selected depending on the state of the DB15/BYTE SEL pin. If the DB15/BYTE SEL is tied low, then serial mode is selected (see the Serial Data Read section) and the parallel byte interface is selected if this pin is tied high (see the Parallel Byte Data Read section).