Keil Logo


ISD51 (In-System Debugger) is a new debug monitor technology for 8051 user programs. ISD51 consists of a configurable library that you link with your application program to provide debug support via the 8051 on-chip UART.

The software and hardware requirements of ISD51 are minimal. It can run from external or on-chip CODE space and requires no special hardware components like von Neumann-wired memory.

ISD51 works on both very small 8051 devices like the Philips LPC series and on complete systems that have access to the full CODE and XDATA address space.

  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.