| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem of a conventional data processor that the access protection of a peripheral device is not sufficient. <P>SOLUTION: The data processor includes: an arithmetic circuit 10 that executes a plurality of programs in a first operation authority level or a second operation authority level and a peripheral device protection circuit 12 that controls access to the peripheral devices of the arithmetic circuit 10. The peripheral device protection circuit 12 has a first protection preset value to designate the permission/denial of access to the peripheral devices and a second protection preset value set as a protection level higher than that of the first protection preset value. The peripheral device protection circuit includes: a setting selection circuit that generates access permission/denial information by referring to the first protection preset value and the second protection preset value when the arithmetic circuit 10 operates at a first operation authority level, or by referring to the second protection preset value when the arithmetic circuit 10 operates at the second operation authority level; and an access protection circuit that determines permission/denial of access to the peripheral devices based on access information output from the arithmetic circuit 10 and the access permission/denial information. <P>COPYRIGHT: (C)2009,JPO&INPIT |
