| 摘要 |
<p>The invention concerns a device for read-protection of at least a zone of a non-volatile storage (10), characterised in that it comprises: an address decoder (40) for supplying on one of the output terminals an addressing signal (NSWHADOW1SEL, NSWHADOWnSEL) when the address corresponds to one of the read-protected zones of the storage (10); a state storage (Mn1, Mn) for each read-protected zone for supplying a state signal (PMPR1, PMPRn) indicating whether the zone is read-protected or not; a programme instruction decoder (DIP) for supplying a programme signal (OP) indicating whether the current addressing operation corresponds or not to a programme instruction; and a logic circuit (42), whereto are applied the addressing signal (NSWHADOW1SEL, NSWHADOWnSEL), the state signal (PMPR1, PMPRn) and the programme signal (OP), for supplying an instruction signal (R10) for reading the read-protected zone when the programme signal (OP) indicates that the current addressing operation concerns a programme instruction.</p> |
