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?
The ADuC702x datasheet recommends pulling the BM pin through a 1kOhm resistor for code execution in the pin description section. However in most cases the internal resistor is sufficient.
Could you confirm what model of the ADuC7021 you are using, i.e. the UART downloader version or I2C downloader version? Are the markings on previous devices and on the new devices similar on the third line (I51 or I31)?