Keil Logo


Information in this article applies to:

  • C51 Version 6.01


What does the NOJMPTAB directive do?


Use the NOJMPTAB directive (abbreviated NOJT) to direct the BL51 code banking linker/locator not to insert the inter-bank call table used for code banking. This directive is provided to enable you to create your own user-defined bank switching mechanism.

The NOJMPTAB directive modifies the behavior of BL51 as follows:

  • The L51_BANK.OBJ banking logic is no longer required.
  • Call instructions are not modified to jump to the call table.
  • Warnings are not generated if a jump or call is made to another bank.

When you use NOJMPTAB, you must ensure that the proper bank is selected before you invoke a function in that bank. The BL51 code banking linker does not select the bank automatically.


  • Refer to NOJMPTAB in the BL51 User's Guide.


Last Reviewed: Friday, July 15, 2005

Did this article provide the answer you needed?
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.