| 摘要 |
<p>An integrated circuit is disclosed in present invention, which includes: a first frequency division unit, a counter, an oscillation signal generation circuit and a second frequency division unit; wherein: the first frequency division unit is used for dividing the frequency of an external clock signal from exterior of the integrated circuit to acquire a first reference clock; the oscillation signal generation circuit is used for generating the oscillation signal; the counter is used for taking count of the oscillation signal using the first reference clock to acquire frequency information of the oscillation signal; and, the second frequency division unit is used for dividing the frequency of the oscillation signal according to a frequency division factor obtained on the basis of the frequency information to acquire a second reference clock. A method for acquiring a reference clock in the integrated circuit is also disclosed in the invention. The solution of the invention can acquire an accurate reference clock under the condition of without a low-frequency crystal oscillator, and save precious pin resources.</p> |
