Motorola Corporation

Grazyna E Muellner

Patrick J Marry

David K Ford

Dennis Joe Cashen

Rafaele Pini

A controller for a radiotelephone having the capability of operation in both a secure mode for call authorization and a nonsecure mode for user interface is disclosed. The nonsecure mode and secure mode of operation are both resident in a single microcontroller which runs the nonsecure operations until a requirement for the secure operation is requested during call placement. The nonsecure mode is disabled during the period of time the secure mode is operational and is reenabled upon completion of the secure mode operation. The secure mode cannot be accessed externally to the microcontroller.

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Bartlett, IL, United States of America

Grazyna E Muellner