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Raisonance 8051 ROM Monitor

The MON-51 8051 Rom Monitor is an executable program for the 8051 family of microcontrollers. Placed at the core of an application, it provides efficient scheduling by driving:
  • Step by step or continuous execution
  • Breakpoints

MON-51 is easy to implement and permits the programmer to debug his/her application.

MON-51 provides support for any compatible derivatives of the 8051. However, it needs a communication link between the development environment (RIDE) and the target where the application is running. This link is usually achieved via the UART that is present on every compatible derivative of the 8051 and consequently this UART cannot be used elsewhere in the application. Hence the use of the ROM-Monitor has an effect on the application. If an application needs to use a UART, it cannot be the same one as used by the ROM-Monitor.


MON-51 consists of two parts:
  • The libraries (not accessible to the programmer).
  • The part used for communication between RIDE and the target board. The source files of this part in 'C' and Assembler are provided to allow the programmer to migrate the ROM-Monitor to a specific board/application.

The contents of the different memory spaces of the current application can be visualized using in the different windows of RIDE.

It is possible, with the MON-51 ROM-Monitor, to modify the content of DATA, XDATA, SFR or BIT memory space. However the SFR registers and bits associated with the UART used by the monitor must never be modified.

The ROM-Monitor is downloaded at the same time as the main program code. It is directly managed by RIDE and allows facilities such as 'step-by-step' execution and inspection of variables. If the target board can 'write to CODE space', advanced features such as 'line-by-line execution' or code breakpoints are also possible.

Available Raisonance 8051 Software Tool Packages

Raisonance 8051 Software Tools are offered in several different product packages. The table below lists the tools included with each of those packages. By following the description link, you can get more information on each tool. By clicking on the product code link you can go directly to the order page for each of the product packages.


Description Link PRODUCTS
LITE Package
Compiler Package
Enterprise Suite
Macro assembler MA-51
Code banking linker LX-51
Utilities UTIL51
ANSI C compiler RC-51
Simulator/debugger SIMICE-51
ROM monitor MON-51
Tiny RTOS KR-51Tiny
3 tasks
3 tasks
3 tasks
full RTOS
CodeCompressor CComp-51
Multiproc. simulation MulSim51
125 tasks
Scripts RIDEscript

* Unrestricted version of the tool is included with the product package
(1) You can compress and simulate, but you can't save the compressed code

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