topic LPC8xx USART in slave synchronous requires three dummy clock to start Tx in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC8xx-USART-in-slave-synchronous-requires-three-dummy-clock-to/m-p/560870#M16173 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by S.Kojima on Wed Jun 08 21:26:10 MST 2016</STRONG><BR /><SPAN>Dear fellows,</SPAN><BR /><BR /><SPAN>I'm trying to use USART in slave synchrounous mode for Tx, but not in success yet....</SPAN><BR /><SPAN>I'm using it with CTRL.CC=0 setting.</SPAN><BR /><SPAN>I believe that Master should supply exact number of clock pulses as frame format setting is made.</SPAN><BR /><SPAN>My MASTER Rx device connected externally generates exact number of clock pulses until STOP bit.</SPAN><BR /><SPAN>e.g. for 8E1 setting, 8bit, Start, Stop and even-parity --&gt; Eleven pulses.</SPAN><BR /><BR /><SPAN>It seems ,,,,,</SPAN><BR /><SPAN>extra three clock pulses are ALWAYS required for LPC8xx USART Tx to make it feed the signal level of START bit, which is "L".</SPAN><BR /><BR /><SPAN>Is this behavior an intended one as USART's design spec ?</SPAN><BR /><BR /><SPAN>Regards,</SPAN><BR /><SPAN> </SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 20:00:10 GMT lpcware 2016-06-15T20:00:10Z LPC8xx USART in slave synchronous requires three dummy clock to start Tx https://community.nxp.com/t5/LPC-Microcontrollers/LPC8xx-USART-in-slave-synchronous-requires-three-dummy-clock-to/m-p/560870#M16173 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by S.Kojima on Wed Jun 08 21:26:10 MST 2016</STRONG><BR /><SPAN>Dear fellows,</SPAN><BR /><BR /><SPAN>I'm trying to use USART in slave synchrounous mode for Tx, but not in success yet....</SPAN><BR /><SPAN>I'm using it with CTRL.CC=0 setting.</SPAN><BR /><SPAN>I believe that Master should supply exact number of clock pulses as frame format setting is made.</SPAN><BR /><SPAN>My MASTER Rx device connected externally generates exact number of clock pulses until STOP bit.</SPAN><BR /><SPAN>e.g. for 8E1 setting, 8bit, Start, Stop and even-parity --&gt; Eleven pulses.</SPAN><BR /><BR /><SPAN>It seems ,,,,,</SPAN><BR /><SPAN>extra three clock pulses are ALWAYS required for LPC8xx USART Tx to make it feed the signal level of START bit, which is "L".</SPAN><BR /><BR /><SPAN>Is this behavior an intended one as USART's design spec ?</SPAN><BR /><BR /><SPAN>Regards,</SPAN><BR /><SPAN> </SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 20:00:10 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC8xx-USART-in-slave-synchronous-requires-three-dummy-clock-to/m-p/560870#M16173 lpcware 2016-06-15T20:00:10Z Re: LPC8xx USART in slave synchronous requires three dummy clock to start Tx https://community.nxp.com/t5/LPC-Microcontrollers/LPC8xx-USART-in-slave-synchronous-requires-three-dummy-clock-to/m-p/560871#M16174 <HTML><HEAD></HEAD><BODY><SPAN>bump</SPAN></BODY></HTML> Sun, 19 Jun 2016 01:12:45 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC8xx-USART-in-slave-synchronous-requires-three-dummy-clock-to/m-p/560871#M16174 lpcware 2016-06-19T01:12:45Z