Data processor and data processing system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 2, 2004
Grant Date -
N/A
app pub date -
Oct 5, 2000
filing date -
Oct 28, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A data processor includes the normal mode providing narrow access space of CPU and the advance mode providing wide access space. Even in the normal mode, the transfer control section assures data transfer control exceeding the address range for access from CPU. Even when programs are generated exceeding the limit of program capacity for the access range of CPU in the normal mode, if the programs exceeding such limit are stored in the non-access area of ROM 6 in the normal mode, the transfer control section accesses such programs and transfers these programs to RAM. Thereby CPU in the normal mode can use such programs transferred to RAM by making access thereto. Accordingly, limit of program capacity can be alleviated, while maintaining good program execution efficiency in the rather small access space of CPU in the data processor.
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