MICROCOMPUTER AND METHOD FOR CONTROLLING MEMORY ACCESS

摘要

A microcomputer including a CPU, a plurality of protection information storages configured to store memory protection information specifying an access permission state or access prohibited state to a memory space by a program executed by the CPU, a memory access control apparatus configured to determine whether or not to allow a memory access request from the CPU according to the memory protection information, and a reset apparatus configured to output a reset signal to the plurality of protection information storages according to a reset request output from the CPU according to a switching of programs executed by the CPU. Each of the plurality of protection information storages is set to a second memory protection state according to the reset signal from a first memory protection state.

主权项

1. A microcomputer comprising:
a CPU (central processing unit); a plurality of protection information storages configured to store memory protection informations specifying an access permission state or access prohibited state to a memory space by a program executed by the CPU; a memory access control apparatus configured to determine whether or not to allow a memory access request from the CPU according to the memory protection information; and a reset apparatus configured to output a reset signal to the plurality of protection information storages according to a reset request output from the CPU according to a switching of programs executed by the CPU, wherein each of the plurality of protection information storages is set to a second memory protection state according to the reset signal from a first memory protection state.