TRANSMISSION OF A DIGITAL MESSAGE BETWEEN A MICROPROCESSOR MONITORING CIRCUIT AND AN ANALYSIS TOOL

摘要

The invention relates to a method for the transmission of digital messages by a monitoring circuit (18) which is integrated into a microprocessor (12), said method being performed during the execution of a series of instructions by the microprocessor. Moreover, at least one of said digital messages represents the detection of a jump in the execution of the series of instructions from a source instruction to a destination instruction. The inventive method consists in determining whether or not the jump is associated with a jump instruction from the series of instructions for which the address of the jump destination instruction is explicitly indicated in the instruction. If the answer is in the affirmative, a first value is allocated to a first set of bits or, if the answer is in the negative, a second value is allocated to the first set of bits. Finally, if the first set of bits has been allocated the second value, a third value is allocated to a second set of bits of the digital message, said third value identifying the jump among several types of jumps.