Single-chip microcomputer comprising means for pre

专利名称：Single-chip microcomputer comprising

means for preventing read-out of its internalROM

发明人：Wakimoto, Yasuhiro,Suzuki, Tetsuo申请号：EP84306405申请日：19840919公开号：EP0136155A3公开日：19861217

专利附图：

摘要：A single-chip microcomputer 1 connectable to an external memory 8 forexpanding its address space, has a first mode of operation in which the available memory

region is the region 0000-OFFF of an internal ROM 4 and part of the external memory 8-1, and has a second mode of operation in which the available memory region is the wholeof the external memory 8. Such a microcomputer includes inhibiting means 7 for inhibitingthe switching from the second mode to the first mode, thereby ensuring that thecontents of the internal ROM 4 cannot be read-out.

申请人：FUJITSU LIMITED

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