topic Re: Max frequency of input pulses for LPC1547 in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/Max-frequency-of-input-pulses-for-LPC1547/m-p/513620#M260 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by IanB on Fri Feb 12 09:12:41 MST 2016</STRONG><BR /><SPAN>For the SCT, maximum is half the system clock frequency - see the description of the SCT configuration register. (Table 202 in the LPC1517 manual)</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:07:08 GMT lpcware 2016-06-15T17:07:08Z Max frequency of input pulses for LPC1547 https://community.nxp.com/t5/LPC-Microcontrollers/Max-frequency-of-input-pulses-for-LPC1547/m-p/513619#M259 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by iharihar on Fri Feb 12 07:35:31 MST 2016</STRONG><BR /><SPAN>Hello, everyone.</SPAN><BR /><BR /><SPAN> I want to create a counter of high frequency pulses using&nbsp; </SPAN><BR /><SPAN> an external special counter chip and LPC1547 SCTimer ( in counter mode) connected consecutively.</SPAN><BR /><BR /><SPAN> What max frequency of the pulses (duty cycle 50%)&nbsp; can I count reliably?</SPAN><BR /><SPAN> My LPC1547 board has 12Mhz ext osc and 72Mhz&nbsp; system clock. </SPAN><BR /><BR /><SPAN> Can I use QEI module in clock/direction mode for this goal?</SPAN><BR /><SPAN> What is max freq of input signal for QEI module?</SPAN><BR /><SPAN> I did't find anything in LPC15xx data sheet and manual&nbsp; concerning my question.</SPAN><BR /><SPAN> Will&nbsp; NXP support team be able to answer me?</SPAN><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 17:07:07 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Max-frequency-of-input-pulses-for-LPC1547/m-p/513619#M259 lpcware 2016-06-15T17:07:07Z Re: Max frequency of input pulses for LPC1547 https://community.nxp.com/t5/LPC-Microcontrollers/Max-frequency-of-input-pulses-for-LPC1547/m-p/513620#M260 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by IanB on Fri Feb 12 09:12:41 MST 2016</STRONG><BR /><SPAN>For the SCT, maximum is half the system clock frequency - see the description of the SCT configuration register. (Table 202 in the LPC1517 manual)</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:07:08 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Max-frequency-of-input-pulses-for-LPC1547/m-p/513620#M260 lpcware 2016-06-15T17:07:08Z