Abstract: A method and apparatus for use with a keypad for an electronic device including at least one plunger associated with a key, wherein the plunger is moveable between a first position and a second position relative to the electronic device. The apparatus is an electrical assembly including a light guide, and at least one electrical component carried by the light guide and positioned to underlie the key for at least one of a) illuminating the key, and b) changing between a first electrical state and a second electrical state in response to the plunger being moved between the first and second positions to indicate that the key has been operated by a user.

Abstract: A method and apparatus for minimizing internal frequency errors in a crystal oscillator is disclosed. A microprocessor generates a voltage control signal in response to received inputs regarding the temperature of an associated voltage control temperature controlled crystal oscillator, a value from a default table at the detected temperature and a value from a compensation table at the detected temperature. This information is used to calculate the error for the presently applied voltage control signal. From this error, a new compensation value is calculated and entered into the compensation table at the detected temperature.