Nowadays, reconfigurable and multiprocessor systems are becoming increasingly attractive for many applications. Such systems should be more and more dependable especially if errors occur on bits which change the circuit functionality (reconfiguration bits). In addition, mechatronic and automatically controlled systems often work in harsh environmental conditions which make them more prone to errors due to various disturbances. Thus, designers must consider ways to protect them against such errors. In this paper, a special interest is allowed to the processor architecture dependability. First, we present a stack processor architecture suitable for dependable mechatronic applications (automation, process control) which is implemented using a stack processor emulator. Then, we show the results obtained using a protection method depending on fault injection models integrated on the emulator.