JTAG/SWD connector for Kinetis

[b51427]

Hi,

I am designing a PCB for Kinetis K22 and have some confusion in SWD connector pin configuration.

There are two different configurations available, one is SWD connector in FRDM-K22F schematic (TDI and TDO pins are not used).

The other configuration is available in user manual of PE Micro U-Multilink (TDI and TDO pins are used).

I would like to know about the difference in these two configurations (how is it possible to program microcontroller without TDI and TDO pins)?

I intend to use PE Micro U-Multilink programmer for programming my custom board MCU, which of the two pin configuration should I use?

Regards,

Saad

[EarlOrlando · Accepted solution]

Hello Saad,

This MCU supports SWD and JTAG debug interfaces. SWD needs only DIO and CLK lines while JTAG needs TMC, TCK, TDO, TDI and RESET lines.

I recommend you to take a look into this document from ARM where the differences between SWD and JTAG are explained.

Regards,

Earl.