Microcomputer with internal selection of on-chip or off-chip acc

Details Microcomputer with internal selection of on-chip or off-chip acc Microcomputer with internal selection of on-chip or off-chip acc

1981-06-22

1986-04-01

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 922

Patent

active

045802165

ABSTRACT:
A microcomputer device contains a CPU with an arithmetic/logic unit and data/address registers on a single semiconductor integrated circuit having on-chip macrocode and microcode storage. In the normal single-chip operation mode, a macrocode word is fethched from on-chip ROM and stored in an instruction register in the CPU, then a sequence of microcode words is fetched from the microcode store based on this macrocode word. In another mode, such as used for self-test employing a check-code, the device loads macrocode from external into on-chip RAM then executes from RAM to perform the desired routine, switching modes of operation.

REFERENCES:
patent: 3962682 (1976-06-01), Bennett
patent: 4050058 (1977-09-01), Garlic
patent: 4093982 (1978-06-01), Heur et al.
patent: 4259718 (1981-03-01), Kaman et al.
patent: 4314353 (1982-02-01), Gunter et al.
patent: 4349870 (1982-09-01), Shaw et al.
patent: 4382279 (1983-05-01), Ugon
"MC6801 8-Bit Single-Chip Microcomputer Reference Manual"; Motorola, Inc.; 1980; pp. 1-1-1.5, 2-1-2-8; 3-7-3-9, 3-27.

Affiliated with

Also associated with

Rating

Microcomputer with internal selection of on-chip or off-chip acc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microcomputer with internal selection of on-chip or off-chip acc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microcomputer with internal selection of on-chip or off-chip acc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1088123