Patent ID: 8395483

Claim:
An electronic reader device comprising: a host that provides a power adjustment command that indicates one of at least three power states for the power controller; a power controller that receives the power adjustment command from the host, the power controller comprising at least one register, the register comprising at least two bits that identify the power state of the power controller; at least one power supply controlled by the power controller comprising a core power supply, an input/output power supply and a memory power supply; and a display controller that performs an operation based on the power state of the power controller; wherein at least one of: (1) when the power controller is in the on power state, the bits of the register are adjusted to 11 and the core power supply, the input/output power supply and memory power supply are adjusted to an on power; (2) when the power controller is in the deep sleep power state, the bits of the registers are adjusted to 01 and the core power supply and the input/output power supply are adjusted to an off power state; (3) when the power controller is in the sleep power state, the bits of the register are adjusted to 10 and the input/output power supply is adjusted to an off power state and the core power supply and the memory power supply are adjusted to an on power state; and (4) when the power controller is in the off power state, the bits of the register are adjusted to 00; and the core power supply, the input/output power supply and memory power supply are adjusted to an off power state.