Digital Signal ControllersのトピックRe: If external crystal waveform abnormal, whether OSC module will automatically shut down XTAL and EXTAL voltage? https://community.nxp.com/t5/Digital-Signal-Controllers/If-external-crystal-waveform-abnormal-whether-OSC-module-will/m-p/549533#M807 <HTML><HEAD></HEAD><BODY><P>There is no automatic action.</P><P>It is up to the firmware to detect this and switch over to the internal relaxation osc.</P></BODY></HTML> Fri, 08 Jul 2016 17:18:07 GMT johnlwinters 2016-07-08T17:18:07Z If external crystal waveform abnormal, whether OSC module will automatically shut down XTAL and EXTAL voltage? https://community.nxp.com/t5/Digital-Signal-Controllers/If-external-crystal-waveform-abnormal-whether-OSC-module-will/m-p/549532#M806 <HTML><HEAD></HEAD><BODY><P>The MCU type is MC56F84763, if environment temperature is higher than 70 degree Celsius, one of the prototype external crystal stop working, there is no waveform output of XTAL and EXTAL pin. If replace the crystal with another one and this crystal is proved to be good, the issue still exists. It seems like not crystal issue. My question is if MCU detects external crystal output abnormal or PLL loss of lock failure, whether OSC module will automatically shut down XTAL and EXTAL voltage, make the external crystal stop oscillating?</P></BODY></HTML> Fri, 08 Jul 2016 03:17:47 GMT https://community.nxp.com/t5/Digital-Signal-Controllers/If-external-crystal-waveform-abnormal-whether-OSC-module-will/m-p/549532#M806 larryyang 2016-07-08T03:17:47Z Re: If external crystal waveform abnormal, whether OSC module will automatically shut down XTAL and EXTAL voltage? https://community.nxp.com/t5/Digital-Signal-Controllers/If-external-crystal-waveform-abnormal-whether-OSC-module-will/m-p/549533#M807 <HTML><HEAD></HEAD><BODY><P>There is no automatic action.</P><P>It is up to the firmware to detect this and switch over to the internal relaxation osc.</P></BODY></HTML> Fri, 08 Jul 2016 17:18:07 GMT https://community.nxp.com/t5/Digital-Signal-Controllers/If-external-crystal-waveform-abnormal-whether-OSC-module-will/m-p/549533#M807 johnlwinters 2016-07-08T17:18:07Z Re: If external crystal waveform abnormal, whether OSC module will automatically shut down XTAL and EXTAL voltage? https://community.nxp.com/t5/Digital-Signal-Controllers/If-external-crystal-waveform-abnormal-whether-OSC-module-will/m-p/549534#M808 <HTML><HEAD></HEAD><BODY><P>Get it. Thanks a lot!</P></BODY></HTML> Sat, 09 Jul 2016 01:33:26 GMT https://community.nxp.com/t5/Digital-Signal-Controllers/If-external-crystal-waveform-abnormal-whether-OSC-module-will/m-p/549534#M808 larryyang 2016-07-09T01:33:26Z