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How to use active crystal?

Question asked by 义福 郭 on Feb 7, 2018
Latest reply on Feb 8, 2018 by lama

      In our project, MC9S128G is used as a single chip microcomputer. The clock USES 3.3V active crystal vibration, and the crystal oscillator output end adopts two resistance partial pressures, reducing the output clock amplitude to below 1.8V, about 1V.But the debugging finds that it is stuck at the while(CPMUFLG_LOCK==0);That is, PLL never locks.Can you provide a bit of this single chip to use active crystal to use.Thank you very much!