Abstract: A processing unit includes a plurality of subcircuits and circuitry for generating clock signals thereto. Detecting circuitry detects the assertion of a first signal indicative of a request for suspending operation of the processing unit and the assertion of a second signal indicating the state of operation of a coprocessing unit. Disabling circuitry is operable to disable clock signals to one or more of the subcircuits responsive to the first and second control signals.

Abstract: A processing unit includes a plurality of subcircuits and circuitry for generating clock signals thereto. Detection circuitry detects the assertion of a control signal and disabling circuitry is operable to disable the clock signals to one or more of the subcircuits responsive to the control signal.

Abstract: A microprocessor has a plurality of input/output pins and processing coupled to the input/output pins. Circuitry is provided for selectively decoupling the processing circuitry with one or more of the input/output pins such that pins associated with enhanced features may be decoupled to provide compatibility with a desired microprocessor architecture.

Abstract: A global position system (GPS) capable of multiple (two or more space vehicles) space vehicle (SV) multiplexing comprises an RF energy receiver for receiving high and low frequencies (L.sub.1 and L.sub.2) from a plurality of SVs on different codes, a switching means for alternately switching the RF receiver between the coded L.sub.1, L.sub.2 signals for detection, a digital processing means, replica coded L.sub.1, L.sub.2 signal producing hardware, and a coherent time and frequency synthesis means, said digital processing means connected to the RF receiver, coherent time and frequency synthesis means, and replica coded L.sub.1, L.sub.2 signal producing hardware for producing for the RF receiver replica coded L.sub.1, L.sub.

Abstract: A global positioning system comprises an RF receiver for receiving L.sub.1, L.sub.2 p-code or ca code modulated frequency outputs from one or more space vehicles, a multiplexer operably connected to the receiver multiplexes the L.sub.1 and L.sub.2 signals to the receiver, and code and carrier tracking loops operably connected to the receiver, each loop including a plurality of filters, one for tracking line-of-sight dynamics and another for determining ionosphere effects on the L.sub.1 and/or L.sub.2 signals.