| 摘要 |
An arrangement for clock control in a device receiving a clock from an external source includes a switching device for switching an external clock through to the device as an internal clock, and clock request generation devices, adapted to switch clock signals through to the external clock controller as requests for suppressing and restarting the external clock. Control devices are provided in the form of a state machine to control the generation of the internal clock through the switching device and to control the clock request generation device in accordance with a predetermined state of two signals, one generated internally by the device, the other by the external clock controller. The clock request generation devices are also coupled to a clock start module adapted to receive several input signals for signaling an event requiring the clocked operation of the device. |
