topic mk20 RTC in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/mk20-RTC/m-p/660595#M40567 <HTML><HEAD></HEAD><BODY><P>sir,</P><P>i am using MK20dx128vlh5 freedom board.</P><P>In that ,i am trying check RTC_CLKout ,</P><P>But it not working and</P><P>How to configure the PORTC3 pin as CLKOUT</P></BODY></HTML> Wed, 28 Sep 2016 10:41:48 GMT sreeramadhanala 2016-09-28T10:41:48Z mk20 RTC https://community.nxp.com/t5/Kinetis-Microcontrollers/mk20-RTC/m-p/660595#M40567 <HTML><HEAD></HEAD><BODY><P>sir,</P><P>i am using MK20dx128vlh5 freedom board.</P><P>In that ,i am trying check RTC_CLKout ,</P><P>But it not working and</P><P>How to configure the PORTC3 pin as CLKOUT</P></BODY></HTML> Wed, 28 Sep 2016 10:41:48 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/mk20-RTC/m-p/660595#M40567 sreeramadhanala 2016-09-28T10:41:48Z Re: mk20 RTC https://community.nxp.com/t5/Kinetis-Microcontrollers/mk20-RTC/m-p/660596#M40568 <HTML><HEAD></HEAD><BODY><P>Hi, Sreerama,</P><P></P><P>This is the PTC3 function:</P><P>B8 PTC3/<BR />LLWU_P7<BR />CMP1_IN1 CMP1_IN1 PTC3/<BR />LLWU_P7<BR />SPI0_PCS1 UART1_RX FTM0_CH2 CLKOUT I2S0_TX_BCLK</P><P>if you want to configure the PTC3 as CLKOUT pin, this is the procedure:</P><P>1)Enable portC gated clock</P><P>SIM_SCGC5|=0x800; //set the PORTC bit, bit 12</P><P>2)set MUX bits in the PORTC_PCR3</P><P>PORTC_PCR3&amp;=0x700;</P><P>PORTC_PCR3|=5&lt;&lt;8; //ALT5 is CLKOUT</P><P>3)set the CLKOUTSEL bits in SIM_SOPT2 to output different clcok</P><P></P><P>CLKOUT select<BR />Selects the clock to output on the CLKOUT pin.<BR />000 FlexBus CLKOUT<BR />001 Reserved<BR />010 Flash clock<BR />011 LPO clock (1 kHz)<BR />100 MCGIRCLK<BR />101 RTC 32.768kHz clock<BR />110 OSCERCLK0</P><P>Hope it can help you</P><P>BR</P><P>Xiangjun Rong</P></BODY></HTML> Thu, 29 Sep 2016 06:37:47 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/mk20-RTC/m-p/660596#M40568 xiangjun_rong 2016-09-29T06:37:47Z