Single chip microcomputer having unauthorized memory space acces

Details Single chip microcomputer having unauthorized memory space acces Single chip microcomputer having unauthorized memory space acces

1991-03-19

1991-11-19

Chan, Eddie P.

Boots, shoes, and leggings

3642864, 3642865, 3642329, 3642466, 36424531, 364DIG1, G06F 1200, G06F 1214

Patent

active

050670778

ABSTRACT:
A single-chip microcomputer connectable to an external memory for expanding the address space, and having a first mode of operation in which the available memory region is both the region of an internal ROM and the external memory, and having a second mode of operation in which the available memory region is the region of the external memory only. An inhibiting device is provided for inhibiting the switching from the second mode to the first mode, thereby ensuring that the contents of the internal ROM cannot be read-out.

REFERENCES:
patent: 4045782 (1977-08-01), Anderson et al.
patent: 4153933 (1979-05-01), Blume, Jr. et al.
patent: 4368515 (1983-01-01), Nielsen
patent: 4450524 (1984-05-01), Oberman
patent: 4504926 (1985-03-01), Toyoda
patent: 4580212 (1986-04-01), Hosaka
patent: 4584665 (1986-04-01), Vrielink
patent: 4698750 (1987-10-01), Wilkie et al.
patent: 4701886 (1987-10-01), Sakakibara et al.
Gary Fielland, "Keep the Memory Interface Simple", Electronic Design, vol. 9, Apr. 26, 1978, pp0. 84-92.

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