topic Re: Is the KE02 SWD_DIO, SWD_CLK require external pullup/down resistors? in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-the-KE02-SWD-DIO-SWD-CLK-require-external-pullup-down/m-p/373786#M19525 <HTML><HEAD></HEAD><BODY><P>Hello Isao:</P><P></P><P>Sorry for the time with no responses. Regarding your questions:</P><P></P><P><STRONG>1)</STRONG> The recommended range is from 4.7KΩ to 10KΩ.</P><P><STRONG>2)</STRONG> Pulldown resistor is used for signal stability purposes. There are no restrictions but you may not be able to program the MCU.</P><P><STRONG>3)</STRONG> SWD_DIO pin has an internal pullup, so external pullup is recommended but not necessary.</P><P><BR />Regards!,<BR />Jorge Gonzalez</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Wed, 24 Sep 2014 17:02:25 GMT Jorge_Gonzalez 2014-09-24T17:02:25Z Is the KE02 SWD_DIO, SWD_CLK require external pullup/down resistors? https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-the-KE02-SWD-DIO-SWD-CLK-require-external-pullup-down/m-p/373785#M19524 <HTML><HEAD></HEAD><BODY><P>According to the note 1 in 9.2 Debug port pin descriptions of KE02 reference manual, we need to add external pulldown resistor for the SWD_CLK to fully support SWD protocol.</P><P>Please advise the below questions as soon as possible.</P><P>1. Please tell us recommended pulldown resistor value.</P><P>2. Please tell us restriction if we don't add external pulldown resistor.</P><P>3. Is the SWD_DIO require pullup or pulldown resistor to fully support SWD protocol?</P><P></P><P>Best regards,</P><P>Takashima</P></BODY></HTML> Wed, 17 Sep 2014 06:24:08 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-the-KE02-SWD-DIO-SWD-CLK-require-external-pullup-down/m-p/373785#M19524 isaotakashima 2014-09-17T06:24:08Z Re: Is the KE02 SWD_DIO, SWD_CLK require external pullup/down resistors? https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-the-KE02-SWD-DIO-SWD-CLK-require-external-pullup-down/m-p/373786#M19525 <HTML><HEAD></HEAD><BODY><P>Hello Isao:</P><P></P><P>Sorry for the time with no responses. Regarding your questions:</P><P></P><P><STRONG>1)</STRONG> The recommended range is from 4.7KΩ to 10KΩ.</P><P><STRONG>2)</STRONG> Pulldown resistor is used for signal stability purposes. There are no restrictions but you may not be able to program the MCU.</P><P><STRONG>3)</STRONG> SWD_DIO pin has an internal pullup, so external pullup is recommended but not necessary.</P><P><BR />Regards!,<BR />Jorge Gonzalez</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Wed, 24 Sep 2014 17:02:25 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-the-KE02-SWD-DIO-SWD-CLK-require-external-pullup-down/m-p/373786#M19525 Jorge_Gonzalez 2014-09-24T17:02:25Z