Keil Logo

Register Usage

Assembler functions may change all register contents in the currently selected register bank as well as the contents of the ACC, B, DPTR, and PSW registers. When invoking a C function from assembly, assume that these registers are destroyed by the C function that is called.

  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.