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In microcontroller there are two architectures of computer: von newman and havard. In Von Newman architecture data and program code reside in the same memory space so you could easily execute any code which happened to be in RAM. While for Havard architecture which separate the data and program code , the program code always stored in ROM or Flash ROM while the data is in the RAM. It is not very easy to excecute the code in RAM, since the nature of Havard architecture is to execute program code in ROM/Flash ROM. Yet I think we could do it indirectly.
If your controller can it, simply load pc (programm counter) with the new ram adress, or make a call and then manipulate the stack, or make a software interrupt or ...
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