Microprocessor with extended memory has two instruction sets controlling exclusive access to two memory zones

摘要

The microprocessor comprises a processing unit (1) and an addressable memory space (2). This comprises a base memory zone (2a) and an extended memory zone (2b). Two instruction sets are provided for accessing the two respective memory zones, such that when one set is in use, access may only be gained to the respective memory zone. The microprocessor comprises a processing unit (1) and a connection system with access to an addressable memory space (2). The processor is able to execute the instructions derived from a set comprising instructions for accessing the memory space. The memory space has a base memory zone (2a) and an extended memory zone (2b). The instruction set includes a first set of instructions for accessing the base memory zone and a second set of instructions for accessing the extended memory zone. The microprocessor includes a system for preventing any access to the extended memory zone when the processor is executing instructions from the first instruction set. The microprocessor is thus forced to use the appropriate memory region when executing instructions from one or other of the two memory areas.