Microcomputer having different memory capacities that can be sel

Details Microcomputer having different memory capacities that can be sel Microcomputer having different memory capacities that can be sel

1997-10-31

2000-07-18

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711103, 711104, G06F 944, G06F 1578

Patent

active

06092148&

ABSTRACT:
In the manufacture of microcomputers, the output of either of two memory capacity select circuits is selected using a mask that is used for selecting data of a mask ROM, then the selected output is used to change the address space in which a built-in ROM is effective, and the space in which an external address corresponding to the storage capacity of the built-in ROM is effective is switched, whereby at least two kinds of storage capacities of the built-in memory and spaces in which external addresses corresponding thereto are effective can be selected.

REFERENCES:
patent: 4488257 (1984-12-01), Hosaka
patent: 5432742 (1995-07-01), Ihara et al.
patent: 5467457 (1995-11-01), Kohda et al.
patent: 5680343 (1997-10-01), Kamaya
patent: 5835398 (1998-11-01), Hirose
patent: 5893927 (1999-05-01), Hovis
patent: 5907507 (1999-05-01), Watannabe et al.

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