Mikrocomputer

摘要

In a microcomputer in which a plurality of user programmes are to be run, an MMU ensures that none of the user programmes can access the other programmes. To make possible the use of common library programmes, however, and at the same time to avoid an uncontrolled entry into said programmes, a vector storage region is provided in which the start addresses of the library programmes are entered as branch destinations (vectors: 1050, 3000). To call a library programme, the vector number (0...n) is input, from which the MMU determines the corresponding address in the vector storage region.