SWD Debug and Sharing GPIO on a K22

[matthewthorne]

Hi Everyone, new to this forum and no doubt will have an array of technical questions after switching from PIC to Kinetis hardware development...

Anyway...

Going to be using a Kinetis K22 80pin package, and soucring the reference manuals, I will be using SWD for debug/programming.

What should I connect my GROUNDDetect Line to? Is it used on SWD?

Also, the 3v3... is that a 'sense' for the programmer or a power to my MCU? I will be powering the MCU locally, as there are several other 3V3 devices on the board sharing that net.

Thanks!

Matt

[Hui_Ma]

Hi Matt,

Please refer Kinetis Peripheral Module Quick Reference page35 about K22 SWD debugger interface (Figure 2-8).

The pin9 PTA4/EZP_CS_b  can be left floating (this pin with internal pull-up).

Wish it helps.

B.R.

Ma Hui