Power management systems and methods

A portable electronic device comprising an application portion and a carrier portion, the telephone comprising:

• power management circuitry electrically coupled to the application and carrier portions, the power management circuitry operative to:
• power OFF at least a processor;
• and
• provide power to processor engagement memory, wherein at least the processor is powered OFF while the processor engagement memory is powered ON and wherein the memory is electrically coupled to the processor.

A portable electronic device comprising:

• an application portion comprising a processor;
• a carrier portion;
• and
• a display electrically coupled to the application and carrier portions, the display driven by the processor when the application portion is operating in an ON power mode and driven by the carrier portion when the application portion is operating in a low power mode.

A portable electronic device operating in an ON mode comprising an application portion and a carrier portion, the device comprising:

• a plurality of discrete circuitry portions, wherein at least one of the portions is a processor;
• a switch associated with each of the circuitry portions operative to selectively couple and decouple the associated circuitry portion to a power source, each switch electrically coupled to the processor and responsive to instructions provided by the processor;
• and
• interrupt circuitry electrically coupled to the switch associated with the processor and operative to provide an interrupt signal to that switch to couple the processor to the power source.

A method for managing power in a portable electronic device operating in an ON mode, the device comprising an application portion, a carrier portion, and a plurality of discrete circuitry portions that can be selectively coupled and decoupled to a power source, the method comprising:

• providing an interrupt signal;
• powering on a processor in response to the interrupt signal;
• using the processor to provide instructions to selectively power ON and OFF one or more of the discrete circuitry portions;
• and
• using the processor to provide an instruction to power OFF the processor.