Slow Run mode

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Slow Run mode offers program execution and data trace capabilities on MCUs without trace port.

In Slow Run mode winIDEA executes the target application step by step and gathers CPU state information. Based on that winIDEA constructs a trace file for analysis.

The collection and processing of all of these data takes time – this is the reason why this mode is called “Slow Run”. The effective rate is at 30-50 instructions per second, dependent on the architecture used.

Per default “Slow Run” is disabled in winIDEA. To enable Slow Run mode check Debug / Run Control / Use Slow Run. It is available on all architectures.

Note: Even though data trace is recorded, data profiling is not supported.


Slow Run is well-suited to trace small portions of an application.

If library functions are called, Slow Run may need a long time to return, because much code is added. Likewise the execution of a function can last very long in Slow Run mode.

If a trace of a complete application is needed, it is recommended to run the data acquisition in Slow Run mode overnight.

Another limitation of Slow Run mode is the possibly changed behavior of the application. Due to step by step execution the reaction on external signals e.g. timers, interrupts, can be delayed or not happen at all, e.g. if an interrupt is lost.