Kinetis MicrocontrollersのトピックThe Low-Power Timer in the KM34 https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638225#M38533 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>I want to use the Low-Power Timer as a period timer in my application.After setting the value of the register&nbsp;LPTMR_CMR, is there any formula to caculate the period time??How to caculate&nbsp; it??</P></BODY></HTML> Mon, 07 Nov 2016 11:53:27 GMT 小勇邹 2016-11-07T11:53:27Z The Low-Power Timer in the KM34 https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638225#M38533 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>I want to use the Low-Power Timer as a period timer in my application.After setting the value of the register&nbsp;LPTMR_CMR, is there any formula to caculate the period time??How to caculate&nbsp; it??</P></BODY></HTML> Mon, 07 Nov 2016 11:53:27 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638225#M38533 小勇邹 2016-11-07T11:53:27Z Re: The Low-Power Timer in the KM34 https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638226#M38534 <HTML><HEAD></HEAD><BODY><P>Hi</P><P></P><P>The value of the delay (in seconds) is<BR /><STRONG>#define LPTMR_S_DELAY(s_delay) (s_delay * LPTMR_CLOCK) - 1)</STRONG><BR />whereby the value of LPTMR_CLOCK depends on where you configure it to be taken from; it can be 1000 (LPO), 32768Hz, 4Meg or 32kHz MCGIRCLK, external clock value or external clock value divided by a prescaler.</P><P></P><P>Regards</P><P></P><P>Mark<BR /><SPAN>Kinetis for professionals: </SPAN><A class="jive-link-external-small" href="https://community.nxp.com/external-link.jspa?url=http%3A%2F%2Fwww.utasker.com%2Fkinetis.html" rel="nofollow" target="_blank">http://www.utasker.com/kinetis.html</A></P></BODY></HTML> Mon, 07 Nov 2016 12:07:43 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638226#M38534 mjbcswitzerland 2016-11-07T12:07:43Z Re: The Low-Power Timer in the KM34 https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638227#M38535 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>Thank you.</P><P>What is the minimum value of the period time? Is it possible to set the period as 1us?</P></BODY></HTML> Mon, 07 Nov 2016 12:26:51 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638227#M38535 小勇邹 2016-11-07T12:26:51Z Re: The Low-Power Timer in the KM34 https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638228#M38536 <HTML><HEAD></HEAD><BODY><P>The minimum delay depends on your clock.<BR />If you use the LPO (1kHz) the minimum delay is 1ms (with value of 0)<BR />If you use the 4MHz IRC you can set 250ns steps - 1us would be a value of 3 in this case.</P><P></P><P>Regards</P><P></P><P>Mark</P></BODY></HTML> Mon, 07 Nov 2016 12:41:15 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/The-Low-Power-Timer-in-the-KM34/m-p/638228#M38536 mjbcswitzerland 2016-11-07T12:41:15Z