Is the KE02 SWD_DIO, SWD_CLK require external pullup/down resistors?

[isaotakashima]

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.

Please advise the below questions as soon as possible.

1. Please tell us recommended pulldown resistor value.

2. Please tell us restriction if we don't add external pulldown resistor.

3. Is the SWD_DIO require pullup or pulldown resistor to fully support SWD protocol?

Best regards,

Takashima

[Jorge_Gonzalez]

Hello Isao:

Sorry for the time with no responses. Regarding your questions:

1) The recommended range is from 4.7KΩ to 10KΩ.

2) Pulldown resistor is used for signal stability purposes. There are no restrictions but you may not be able to program the MCU.

3) SWD_DIO pin has an internal pullup, so external pullup is recommended but not necessary.

Regards!,
Jorge Gonzalez

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------