5.1 Interfacing the AT25080B/AT25160B/AT25320B/AT25640B on the SPI Bus

Communication to and from the AT25080B/AT25160B/AT25320B/AT25640B must be initiated by the SPI Host device, such as a microcontroller. The SPI Host device must generate the serial clock for the AT25080B/AT25160B/AT25320B/AT25640B on the Serial Data Clock (SCK) pin. The AT25080B/AT25160B/AT25320B/AT25640B always operates as a client due to the fact that the SCK is always an input.