https://community.nxp.com/t5/S32K/GPT-time/m-p/2189655#M53705 How to confirm that the clock source currently being used is an external crystal oscillator(16M)? Currently, the GPT clock is not 40M, it seems 50M. Tue, 21 Oct 2025 06:44:58 GMT youngkin 2025-10-21T06:44:58Z https://community.nxp.com/t5/S32K/GPT-time/m-p/2189046#M53672 <P>hello：</P><P>I config the gpt, the gpt clock is 40M. the clock is set as follow:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="youngkin_1-1760947807231.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/361603i7A04585EF5D6D3E8/image-size/medium?v=v2&amp;px=400" role="button" title="youngkin_1-1760947807231.png" alt="youngkin_1-1760947807231.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="youngkin_3-1760947904828.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/361605iA1EA34496B3F3FF6/image-size/medium?v=v2&amp;px=400" role="button" title="youngkin_3-1760947904828.png" alt="youngkin_3-1760947904828.png" /></span></P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="youngkin_0-1760947769185.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/361602iABFFDBBE480EB995/image-size/medium?v=v2&amp;px=400" role="button" title="youngkin_0-1760947769185.png" alt="youngkin_0-1760947769185.png" /></span></P><P>the mcu clock&nbsp; show as follow：</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="youngkin_8-1760948623926.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/361611i53FE80444337CA76/image-size/medium?v=v2&amp;px=400" role="button" title="youngkin_8-1760948623926.png" alt="youngkin_8-1760948623926.png" /></span></P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="youngkin_6-1760948416280.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/361608iFFC71A6BC51DCB45/image-size/medium?v=v2&amp;px=400" role="button" title="youngkin_6-1760948416280.png" alt="youngkin_6-1760948416280.png" /></span></P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="youngkin_7-1760948552963.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/361609i983D42191EC7B2A8/image-size/medium?v=v2&amp;px=400" role="button" title="youngkin_7-1760948552963.png" alt="youngkin_7-1760948552963.png" /></span></P><P>&nbsp;</P><P>and&nbsp; i start the gpt(Gpt_StartTimer(GptConf_GptChannelConfiguration_GptChannelConfiguration_0, 10000000U);),&nbsp; &nbsp;I measure GPT time ，it is 200ms。&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="youngkin_4-1760948024193.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/361606iA04DA5CF54CB3366/image-size/medium?v=v2&amp;px=400" role="button" title="youngkin_4-1760948024193.png" alt="youngkin_4-1760948024193.png" /></span></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="youngkin_5-1760948267512.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/361607i39408FC2B0AB738F/image-size/medium?v=v2&amp;px=400" role="button" title="youngkin_5-1760948267512.png" alt="youngkin_5-1760948267512.png" /></span></P><P>&nbsp;</P><P>but i think the gpt time should be 250ms（（1/40000000）&nbsp;&nbsp; * 10000000 = 250ms）.</P><P>Please take some time to help answer, thank you&nbsp;&nbsp;</P> Mon, 20 Oct 2025 08:27:26 GMT https://community.nxp.com/t5/S32K/GPT-time/m-p/2189046#M53672 youngkin 2025-10-20T08:27:26Z https://community.nxp.com/t5/S32K/GPT-time/m-p/2189655#M53705 How to confirm that the clock source currently being used is an external crystal oscillator(16M)? Currently, the GPT clock is not 40M, it seems 50M. Tue, 21 Oct 2025 06:44:58 GMT https://community.nxp.com/t5/S32K/GPT-time/m-p/2189655#M53705 youngkin 2025-10-21T06:44:58Z https://community.nxp.com/t5/S32K/GPT-time/m-p/2189688#M53706 the mcu is S32K348, Please take some time to answer, thank you！ Tue, 21 Oct 2025 07:03:30 GMT https://community.nxp.com/t5/S32K/GPT-time/m-p/2189688#M53706 youngkin 2025-10-21T07:03:30Z