LPCXpresso IDE中的主题 CODE RED: SWD Connector https://community.nxp.com/t5/LPCXpresso-IDE/CODE-RED-SWD-Connector/m-p/545592#M9294 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by MikeSimmonds on Thu Nov 08 08:22:54 MST 2012</STRONG><BR /><SPAN>[FONT=Tahoma][SIZE=1]On your page "[/SIZE][/FONT][FONT=Tahoma][SIZE=1]SWD / JTAG Connectors and Pinout", you recommend a 10K to 100K</SPAN><BR /><SPAN>pull-down to ground for SWCLK.</SPAN><BR /><BR /><SPAN>Various documents I have seen state that the SWD clock (SWCLK) is idle [I]high[/I].</SPAN><BR /><BR /><SPAN>So is this a mistake on your part, and the clock line is to be pulled [B]up[/B]? :confused:</SPAN><BR /><SPAN>Or is there something that I still do not understand?</SPAN><BR /><BR /><SPAN>Does this pull-up (or pull-down) apply to both the target board and the SWD adapter?</SPAN><BR /><BR /><SPAN>BTW: The LPCXpresso 1769 uses a tri-stated buffer for SWCLK idle (i.e. pull up)</SPAN><BR /><SPAN>and has [I]no[/I] pull ups or downs on the target side.</SPAN><BR /><BR /><SPAN>Please will you clarify/confirm the details, including the recommendations for</SPAN><BR /><SPAN>custom (SWD debugged) target boards.</SPAN><BR /><BR /><SPAN>Cheers, Mike.</SPAN><BR /><SPAN>[/SIZE][/FONT]</SPAN></BODY></HTML> Wed, 15 Jun 2016 23:20:46 GMT lpcware 2016-06-15T23:20:46Z CODE RED: SWD Connector https://community.nxp.com/t5/LPCXpresso-IDE/CODE-RED-SWD-Connector/m-p/545592#M9294 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by MikeSimmonds on Thu Nov 08 08:22:54 MST 2012</STRONG><BR /><SPAN>[FONT=Tahoma][SIZE=1]On your page "[/SIZE][/FONT][FONT=Tahoma][SIZE=1]SWD / JTAG Connectors and Pinout", you recommend a 10K to 100K</SPAN><BR /><SPAN>pull-down to ground for SWCLK.</SPAN><BR /><BR /><SPAN>Various documents I have seen state that the SWD clock (SWCLK) is idle [I]high[/I].</SPAN><BR /><BR /><SPAN>So is this a mistake on your part, and the clock line is to be pulled [B]up[/B]? :confused:</SPAN><BR /><SPAN>Or is there something that I still do not understand?</SPAN><BR /><BR /><SPAN>Does this pull-up (or pull-down) apply to both the target board and the SWD adapter?</SPAN><BR /><BR /><SPAN>BTW: The LPCXpresso 1769 uses a tri-stated buffer for SWCLK idle (i.e. pull up)</SPAN><BR /><SPAN>and has [I]no[/I] pull ups or downs on the target side.</SPAN><BR /><BR /><SPAN>Please will you clarify/confirm the details, including the recommendations for</SPAN><BR /><SPAN>custom (SWD debugged) target boards.</SPAN><BR /><BR /><SPAN>Cheers, Mike.</SPAN><BR /><SPAN>[/SIZE][/FONT]</SPAN></BODY></HTML> Wed, 15 Jun 2016 23:20:46 GMT https://community.nxp.com/t5/LPCXpresso-IDE/CODE-RED-SWD-Connector/m-p/545592#M9294 lpcware 2016-06-15T23:20:46Z Re: CODE RED: SWD Connector https://community.nxp.com/t5/LPCXpresso-IDE/CODE-RED-SWD-Connector/m-p/545593#M9295 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by leon_heller on Thu Nov 08 11:16:56 MST 2012</STRONG><BR /><A href="http://">http://support.code-red-tech.com/CodeRedWiki/HardwareDebugConnections</A><BR /><BR /><SPAN>AFAIK, though, all NXP Cortex devices have internal pull-ups on both SWCLK and SWDIO. I didn't include them on an LPC1114 board I designed.</SPAN></BODY></HTML> Wed, 15 Jun 2016 23:20:46 GMT https://community.nxp.com/t5/LPCXpresso-IDE/CODE-RED-SWD-Connector/m-p/545593#M9295 lpcware 2016-06-15T23:20:46Z