I'm using KEAZ128M microcontroller. I meet a problem. When I config PTB5 as GPIO output, the Default_Handler() below will be triggered.I am using Code Warrior. And I don't use Processor Expert.
I am really confused..what is the reason.
The only thing that comes to mind is if PTB4 is also being configured as an output. That is the NMI pin, which is enabled by default. Are you configuring all of the port B pins, or only PTB5? Could something else be pulling PTB4 low?
I set NMIE bit 0 on SIM_SOPT0 register. And Default Handler don't happens.
But I am still confused why PTB5 will trigger it. Maybe I should check my PCB.
As David mentions maybe the problem is on the code that configures the PTB5 pin as an output, could you share your project to see if I can reproduce the issue on my side?
Thanks in advance!
Technical Support Engineer