The present invention comprises a microcontroller unit including a processor for generating a power down signal. Control logic generates a hold signal responsive to the power down signal. A voltage regulator provides a regulated voltage responsive to an input voltage and powers down responsive to the...http://www.google.es/patents/US8041975?utm_source=gb-gplus-sharePatente US8041975 - Programmable I/O cell capable of holding its state in power-down mode
Programmable I/O cell capable of holding its state in power-down mode
