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Need to use pin PTA4 but not as NMI_b/EZP_CS_b (K21)

Question asked by Eric Chen on Dec 10, 2014
Latest reply on Dec 11, 2014 by Mark Butcher

I need to use PTA4 as an GPIO input pin on K21 device. The pin can also be used for NMI_b/EZP_CS_b.

But I don't want to use the NMI_b/EZP_CS_b signal (but it is the default setting, ALT7/EzPort).


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

Please let me know how I should do.



Best regards.

Eric Chen