METHOD AND DEVICE FOR EXECUTING BY A SINGLE PROCESSOR SEVERAL FUNCTIONS OF DIFFERENT CRITICALITY LEVELS, OPERATING WITH HIGH SECURITY

摘要

In order to execute by means of a processor (70) several functions, the processor having access to an addressable space comprising programme (81) and data (82) memories, and input/output registers (77), the method consists in allocating access right to each function; dividing the addressable space into partitions each associated with a function access right; dividing the processor usage time into cyclic time slots associated with a function access right; at the beginning of each time slot, verifying that the processor has completed the execution of the preceding function, and activating the tasks of the corresponding function; and each time the processor (70) accesses an addressable zone, comparing (113) the current time slot (111) access right with that of the accessed zone, and emitting an error signal in case of inconsistency.