| 摘要 |
<p>An arrangement for clock control in a device receiving a clock from an external source includes switching means (101) for switching an external clock through to the device as an internal clock, and clock request generation means (102, 103), adapted to switch clock signal through to the external clock controller as requests for suppressing and restarting the external clock. Control means (104) are provided in the form of a state machine to control the generation of the internal clock through the switching means, and to control the clock request generation means in accordance with a predetermined state of two signals, one generated internally by the device, the other by the external clock controller (20). The clock request generation means are also coupled to a clock start module adapted to receive several input signals (12) for signalling an event requiring the clocked operation of the device.</p> |
