MSPM0C1104: issue with PA24 GPIO.

Is this on a launchpad? Do you have anything else on the pin?

Hi Seema,

Since the LaunchPad does not have an LED on PA24, I am assuming you are developing a custom board.

Can you share the software you've written? Can you share scope captures of the pin?

Please keep in mind, PA24 has an internal connection for testing purposes, thus there is no injection current allowed on this pin.

If you'd like a schematic review, please share your schematic with your local TSR or FAE.

Best,

Owen

I take Note (2) of Sec 7.1 in the datasheet (SLASF90C) -- quoted by Owen above -- to mean that PA24 can't sink any current.

From your reference to a pull-up, I suspect your LED is wired from Vcc ("active low"), which relies on having the GPIO pin sink the current through the LED.

You may succeed by reversing the LED circuit so that the GPIO pin sources the LED current ("active high").

Bruce McKenney said:

SLASF90C

Sry! We tried reversing LED ,but P24 is not getting more than1V in high state.LED is not getting sufficient voltage.

to turn ON.

Also we tried to check pin output without LED with various settings like pullup ,pull down,standard.

We found P24   pin is not  getting to 0- 1V only.

I think I know what "injection current" is now (it's not sink current), and I believe it's not a concern in this case as long as the high side of your LED circuit is also the MCU Vcc.

I also tried patching PA24 to the low side of J7 on my Launchpad (active-low LED circuit), and the LED lit properly.

So we're back to what Owen requested: (a) Software [notably pin configuration] and (b) Schematic.

[Edit: Minor clarification]

Sry! We can not attach image /code on this forum!