I use pin 3 of port 1 (P1.3) on my products and at power up, the port is in high impedance, everything is ok.
Now we received a new reel of aduc7021 and this port (pin 1.3) now emit a glitch at power_up : 2V during 17ms with a pull down of 68Kohm.
My application doesn't work now!
Do you have changed something? Is there is a solution?
On previous and new devices the markings is the same I31.
I had a NMOS transistor to drive this PIN and the leakage current must be enough to pull down this PIN.
The NMOS is drived through P1.3, if I deasable the Pull-up in the GP1PAR register does it change the port At power-up?