ColdFire/68K Microcontrollers and ProcessorsのトピックMCF5213 external clock and PWM issue https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5213-external-clock-and-PWM-issue/m-p/174636#M6704 <HTML><HEAD></HEAD><BODY><SPAN>I'm using a MCF5213 with an external master clock. I'm also using one of the 5213 PWM outputs to drive a MOSFET to control the speed of a fan. If I stop the master clock, I notice that the PWM will continue to run. I'd like the PWM to stop when the master clocks stops. Why does the PWM continue to run, and how can I get it to stop when the master clock is halted?</SPAN></BODY></HTML> Thu, 23 Apr 2009 04:16:05 GMT pmrshudson 2009-04-23T04:16:05Z MCF5213 external clock and PWM issue https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5213-external-clock-and-PWM-issue/m-p/174636#M6704 <HTML><HEAD></HEAD><BODY><SPAN>I'm using a MCF5213 with an external master clock. I'm also using one of the 5213 PWM outputs to drive a MOSFET to control the speed of a fan. If I stop the master clock, I notice that the PWM will continue to run. I'd like the PWM to stop when the master clocks stops. Why does the PWM continue to run, and how can I get it to stop when the master clock is halted?</SPAN></BODY></HTML> Thu, 23 Apr 2009 04:16:05 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5213-external-clock-and-PWM-issue/m-p/174636#M6704 pmrshudson 2009-04-23T04:16:05Z Re: MCF5213 external clock and PWM issue https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5213-external-clock-and-PWM-issue/m-p/174637#M6705 <HTML><HEAD></HEAD><BODY><P>When you stop the external clock (or even before), can you examine SYNSR and see where&nbsp;the MCU&nbsp;thinks the clock is coming from?&nbsp; Is EXTOSC always set, and OCOSC/CRYOSC clear?&nbsp; There is loss of clock circuitry (SYNCR-&gt;LOCEN), to automatically switch clocks or reset the MCU,&nbsp;but the data sheet seems to imply is disabled when running off an external clock.&nbsp; See Reference Manual section 6.8.4.8.</P><P>&nbsp;</P></BODY></HTML> Thu, 23 Apr 2009 06:21:23 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/MCF5213-external-clock-and-PWM-issue/m-p/174637#M6705 RichTestardi 2009-04-23T06:21:23Z