8 Appendix B: Low Power Modes

OFFMode

OFFMode provides the lowest current consumption. To enter this mode, call the following functions:

• SYS_ATA851X_SetSystemMode(0x97, 0x86)

• SYS_ATA851X_OffCommand()

The device exits OFFMode when one of the NPWRON1..6 pins is set to “LOW” or the PWRON pin is set to “HIGH”, initiating the transition to IDLEMode.

IDLEMode (RC)

IDLEMode (RC) serves as the basic system mode. It allows transition to all supported operating modes. In this mode, most circuits remain deactivated.

Call SYS_ATA851X_SetSystemMode(0x00, 0x00) to enter IDLE Mode (RC).

IDLEMode (XTO)

To enter IDLEMode (XTO), call:

• SYS_ATA851X_SetSystemMode(0x10, 0x00)

IDLEMode (XTO) with CLK OUT2 Enabled

To enter IDLEMode (XTO) with CLK OUT2 enabled, call:

• SYS_ATA851X_SetSystemMode(0x10, 0x60)

Ensure the EEPROM configuration tool clock out option is enabled (under system init>clock>clock out enable.