Keil Logo

µVISION DEBUGGER: PORT 1 ERROR MESSAGE BOX


Information in this article applies to:

  • C51 All Versions
  • µVision Version 2.30

QUESTION

I'm running the debugger and I receive the following error message:

PORT 1 ERROR

You have tried to modify a port pin which is configured as output!

Why am I receiving this message?

ANSWER

This error happens when you try to input some data into Port PIN and, at the same time, you're outputting data.

For example, the instruction

P1 ^= 0x01;               /* Toggle P1.0 each time we print */

During the execution of this instruction, if you manually try to change the state of the physical P1.0 PIN ( Pins ) you will receive this error message. It means that you are outputting and inputting a signal over the port pin at the same time.

RESOLUTION

You may modify Port Pins when you are not outputting data over it.

Last Reviewed: Tuesday, April 20, 2004


Did this article provide the answer you needed?
 
Yes
No
Not Sure
 
  Arm logo
Important information

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies.

Change Settings

Privacy Policy Update

Arm’s Privacy Policy has been updated. By continuing to use our site, you consent to Arm’s Privacy Policy. Please review our Privacy Policy to learn more about our collection, use and transfers
of your data.