Abstract: A clock generating circuit and method therefor are provided, which includes a control unit, a first oscillating module, a second oscillating module, a status control unit, and a multiplexer. The control unit is used for outputting a first control signal and a second control signal so as to drive the first oscillating module and the second oscillating module to generate or stop from a first clock signal and a second signal to the multiplexer.

Abstract: An input detection circuit includes a matrix of keys formed by the intersection of a plurality of columns of keys and a plurality of rows of keys, with a crossover capacitor connected across the intersecting row and column of one of the keys. The input detection circuit further includes circuits for generating a difference in voltage potential across the capacitor, and circuits responsive to the difference in voltage potential across the capacitor for generating a signal representative of the presence of the capacitor. By knowing which keys have been connected with a crossover capacitor, the processor of the telephone will also know what scan options have been programmed.