Variable memory boundaries between external and internal memorie

Details Variable memory boundaries between external and internal memorie Variable memory boundaries between external and internal memorie

1992-11-13

1996-10-15

Lane, Jack A.

395402, 395411, G06F 1200

Patent

active

055663095

ABSTRACT:
A microcomputer according to the present invention is provided with a memory space judgment device to judge whether an access to a memory by the central processing unit is for the internal memory or the external memory. The memory space judgment device has a memory space switching flag serving as a boundary address change mechanism so that the boundary address between the memory mapping region for the internal memory and the memory mapping region for the external memory can be changed by changing the values at the flag. Thus, the region assigned to the internal memory space can be changed to the external memory space, or the region assigned to the external memory space to the internal memory space.

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patent: 4432067 (1984-02-01), Nielsen
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patent: 4521853 (1985-06-01), Guttag
patent: 5093909 (1992-03-01), Saito
patent: 5222226 (1993-06-01), Yamaguchi et al.

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