1. A method for monitoring execution of a program code stored in a memory and generating an error code in response to an erroneous execution of the program code, the method comprising: storing a first instruction of the program code in a first part of a first memory location of a memory; storing a first monitoring instruction relating to monitoring of the first instruction of the program code in a second part of the first memory location different from the first part of the first memory location; simultaneously extracting the first instruction of the program code and the first monitoring instruction from the first memory location, wherein the first instruction of the program code is extracted via a first portion of a data bus to a first processor coupled to the memory by the data bus, and wherein the first monitoring instruction is extracted by a second portion of the data bus to a second processor different from the first processor and coupled to the memory by the data bus; executing, in parallel, the first instruction of the program code using the first processor and the first monitoring instruction using the second processor, wherein executing the first monitoring instruction comprises writing a reference value into a first register of the second processor and commencing a countdown of a counter of the second processor at a cadence of a clock signal; comparing, by a comparator of the second processor and at an end of the countdown of the counter, the reference value stored in the first register with a value stored in a second register of the second processor; and determining, by the second processor, whether an erroneous execution of the first instruction of the program code has occurred based on a comparison of the reference value stored in the first register with the value stored in the second register.