| 摘要 |
PURPOSE: A clock generating device using a dual-port RAM is provided to generate various kinds of clocks required by a system by setting data within a dual-port RAM with a microprocessor. CONSTITUTION: A clock generating device comprises a system clock generating unit(21), a clock multiplier unit(22), a control clock generating unit(23), a storage unit(24), a clock data setting unit(25), and a parallel/serial converting unit(26). The system clock generating unit generates a system clock. The clock multiplier unit receives the system clock from the system clock generating unit to generate an input clock. The control clock generating unit receives the input clock from the clock multiplier unit and frequency divides the input clock to generate a control clock and a load pulse. The storage unit stores clock data, receives at an address terminal the control clock from the control clock generating unit to output clock data within a corresponding address. The clock data setting unit sets clock data stored in the storage unit. The parallel/serial converting unit receives clock data from the storage unit in response to the load pulse from the control clock generating unit, and parallel/serial converts the clock data in response to the input clock from the clock multiplier unit to output a clock of a multiple of a predetermined frequency.
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