Apparatus and method of calibrating a keyless transmitter

Details Apparatus and method of calibrating a keyless transmitter Apparatus and method of calibrating a keyless transmitter

2005-03-08

2005-03-08

Holloway, III, Edwin C. (Department: 2635)

Communications: electrical

Continuously variable indicating

With meter reading

C340S870030, C340S005610, C340S005640, C340S010510, C340S426130, C702S107000

Reexamination Certificate

active

06864800

ABSTRACT:
A crystal-less keyless entry system includes a micro controller, a timing circuit, a memory, and a radio frequency circuit. The memory and timing circuit are a unitary part of the microprocessor. The memory is programmed with a compensation that adjusts an output frequency of the timing circuit such that the output frequency of the timing circuit does not coincide with a frequency discontinuity that occurs within an output of the timing circuit. A method of calibrating the crystal-less keyless entry system includes programming the temperature compensation and a voltage compensation in the memory.

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