I've started a project with the 104 Nano, and needed to use Port A 2 as an output. I set CONFW0 BTYE0.RSTDISBL to set the reset disable bit (0xFE), but the programming fails to verify. I have the same issue with two different 104-XNANO boards.
At first, I thought it was a circuit in the PCB the Xplained board was in, but I have two of them isolated from my project, and they both fail to verify on the reset disable bit, or to set it. Both boards continue to be able to be read and programmed afterwards, instead of needing the NVM reset.
Additionally, I tried erasing the boards first, then setting the reset bit, but I still get "Verify register BYTE0...Failed!" and the bit reads as not set. (The other three fuses can be programmed before and after this step.) I wrote a program to clock all outputs, and they are all measuring as expected on the oscilloscope, other than the PA2/reset line, since I can't get the RSTDISBL to program.
Any suggestions would be appreciated.