topic COLDFIRE UARTS Carrier Detect in ColdFire/68K Microcontrollers and Processors https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/COLDFIRE-UARTS-Carrier-Detect/m-p/147222#M3397 <HTML><HEAD></HEAD><BODY><DIV>Is there any way to implement carrier detect on the RS232 ports ?</DIV><DIV>I see only RTS/CTS.</DIV><DIV>Is there software available to implement using a gpio ?</DIV><DIV>Thanks in advance !</DIV><DIV>John</DIV></BODY></HTML> Thu, 29 Jan 2009 02:05:58 GMT queequeg 2009-01-29T02:05:58Z COLDFIRE UARTS Carrier Detect https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/COLDFIRE-UARTS-Carrier-Detect/m-p/147222#M3397 <HTML><HEAD></HEAD><BODY><DIV>Is there any way to implement carrier detect on the RS232 ports ?</DIV><DIV>I see only RTS/CTS.</DIV><DIV>Is there software available to implement using a gpio ?</DIV><DIV>Thanks in advance !</DIV><DIV>John</DIV></BODY></HTML> Thu, 29 Jan 2009 02:05:58 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/COLDFIRE-UARTS-Carrier-Detect/m-p/147222#M3397 queequeg 2009-01-29T02:05:58Z Re: COLDFIRE UARTS Carrier Detect https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/COLDFIRE-UARTS-Carrier-Detect/m-p/147223#M3398 <HTML><HEAD></HEAD><BODY><DIV></DIV>Hi<BR /><BR />Some of the UARTs support RTS/CTS lines which have capabilities of automatically controlling flow control:<BR /><A href="http://www.utasker.com/forum/index.php?topic=105.msg424#msg424" rel="nofollow" target="_blank">http://www.utasker.com/forum/index.php?topic=105.msg424#msg424</A><BR /><BR />The CTS interrupt capability allows interrupt driven flow control too.<BR /><BR />Since CD input is generally more of an informative nature rather than than controlling data flow (with some reaction constraints) it doesn't usually merit a dedicated modem control signal at the UART.<BR /><BR />The same function can be achieved by any free Edge Port line. When there are no edge ports free further interrupt capability is possible by using timers in edge-capture more and even the interrupt driven trigger functionality of the ADC inputs. More generally polling any free GPIO is often adequate as well.<BR /><BR />Regards<BR /><BR />Mark<BR /><BR /><A href="http://www.uTasker.com" rel="nofollow" target="_blank">www.uTasker.com</A><BR /><DIV></DIV></BODY></HTML> Thu, 29 Jan 2009 04:21:17 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/COLDFIRE-UARTS-Carrier-Detect/m-p/147223#M3398 mjbcswitzerland 2009-01-29T04:21:17Z