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Need to use pin PTA4 but not as NMI_b (KL15)

Question asked by markosiponen on Jul 29, 2013
Latest reply on Jul 29, 2013 by Hui_Ma

I need to use PTA4 as an GPIO input pin on a KL15 device. The pin can also be used for NMI_b. But I don't want to use the NMI_b signal (but it is the default setting, ALT7).


What do I need to think about?


Do I just need to configure PORTA_PCR4[MUX] = 1 (ALT1) and then also clear set FTFA_FOPT[NMI_DIS] = 0?


I see that the Processor expert doesn't clear the FTFA_FOPT[NMI_DIS] bit, it only set PORTA_PCR4[MUX] = 1. But then the NMI_b would be active for a short while after reset?