| 摘要 |
A programmable frequency synthesizer includes a first memory (e.g., ROM) for storing a plurality of pre-programmed frequencies, a second memory (e.g., RAM) for storing at least one user input programmable frequency, and dual purpose frequency synthesizer inputs for providing command address information to select one of the pre-programmed frequencies from the first memory and for providing serial data representing a user input programmable frequency to be stored in the second memory. The frequency synthesizer further includes a control input and decoder for directing the address information and the user input programmable frequency data to the first or second memory, respectively.
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