The present invention, in one embodiment, is a method for operating an electronic electric meter having current and voltage sensors configured to generate measurements of current and voltage, respectively; a microcomputer coupled to the current and voltage sensors and having on-chip masked read only...http://www.google.com.hk/patents/US7065457?utm_source=gb-gplus-share專利 US7065457 - Methods and apparatus for updating firmware in an electronic electricity meter
