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CCS/TMS320F28031: Need to make a by default high I/O pin to low level earliest possible.

sachin kumar1
Prodigy 40 points
Part Number: TMS320F28031

Tool/software: Code Composer Studio

GPIO23 is by default high. By the time I make it low in main function, it gives a high pulse. 

How can I avoid this short pulse of high output?

  • 0
    TI__Guru 61235 points

    Hi Sachin,

    GPIO23 defaults to Hi-Z at reset, with the internal pullup enabled.  You can over-power the internal pullup by using a stronger external pulldown.  The internal pullup is an active pullup (not just a resistor).  Its maximum pull current is -205uA (see datasheet sprs584l, Section 5.6).

    Regards,

    David