topic Re: LPC13xx Uart Initialisation in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC13xx-Uart-Initialisation/m-p/546158#M13198 <HTML><HEAD></HEAD><BODY><P>Hi Mike,</P><P>Thank you for your interest in NXP LPC product, I would like to provide service for you!</P><P>At first, we need to know the function of IOCONFIG register.</P><P>It configures the pin function, mode, hysteresis, opendrain mode.</P><P>What's the pin function?</P><P>Take PIO1_7 as an example, this pin have IO function, UART TXD function, CT32B0_MAT1 function.</P><P>How did the cpu know the PIO1_7 function? just use this register to configure it.</P><P>After reset, the FUNC is 0, it is the IO function.</P><P>So, if you don't configure the pin as UART function, even you operate the UART module, the pin can't send the uart data, you can't do the uart communication.</P><P></P><P>Wish it helps you!</P><P>If you still have question, please let me know!</P><P></P><P><BR />Have a great day,<BR />Jingjing</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Tue, 23 Aug 2016 06:16:07 GMT kerryzhou 2016-08-23T06:16:07Z LPC13xx Uart Initialisation https://community.nxp.com/t5/LPC-Microcontrollers/LPC13xx-Uart-Initialisation/m-p/546157#M13197 <HTML><HEAD></HEAD><BODY><P>In the user manual UM10375 (rev 5) section 12.2, it states that ...</P><P>Pins: For the LPC1311/13/42/43 parts, the UART pins must be configured in the </P><P>IOCONFIG register block (Section 7.4) before the UART clocks can be enabled.</P><P></P><P>What happens if the clock are enabled first?</P><P>(a) non-operation,</P><P>(b) unreliable operation,</P><P>(c) chip explodes,</P><P>(d) other, Please specify!</P><P></P><P>Cheers, Mike.</P></BODY></HTML> Mon, 22 Aug 2016 04:12:00 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC13xx-Uart-Initialisation/m-p/546157#M13197 mikesimmonds 2016-08-22T04:12:00Z Re: LPC13xx Uart Initialisation https://community.nxp.com/t5/LPC-Microcontrollers/LPC13xx-Uart-Initialisation/m-p/546158#M13198 <HTML><HEAD></HEAD><BODY><P>Hi Mike,</P><P>Thank you for your interest in NXP LPC product, I would like to provide service for you!</P><P>At first, we need to know the function of IOCONFIG register.</P><P>It configures the pin function, mode, hysteresis, opendrain mode.</P><P>What's the pin function?</P><P>Take PIO1_7 as an example, this pin have IO function, UART TXD function, CT32B0_MAT1 function.</P><P>How did the cpu know the PIO1_7 function? just use this register to configure it.</P><P>After reset, the FUNC is 0, it is the IO function.</P><P>So, if you don't configure the pin as UART function, even you operate the UART module, the pin can't send the uart data, you can't do the uart communication.</P><P></P><P>Wish it helps you!</P><P>If you still have question, please let me know!</P><P></P><P><BR />Have a great day,<BR />Jingjing</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Tue, 23 Aug 2016 06:16:07 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC13xx-Uart-Initialisation/m-p/546158#M13198 kerryzhou 2016-08-23T06:16:07Z