Microprogram controlled microprocessor having a selectively expa

Details Microprogram controlled microprocessor having a selectively expa Microprogram controlled microprocessor having a selectively expa

1988-11-01

1992-05-26

Lee, Thomas C.

Boots, shoes, and leggings

3642558, 3642599, 3642606, 3642624, 3642628, 3642629, 36426281, 3642631, 3642611, 3642612, 364DIG1, G06F 922, G06F 926, G06F 930, G06F 934

Patent

active

051174880

ABSTRACT:
In a microprocessor, a minimum instruction code length is set to a predetermined number of bits (e.g. one byte) length. One feature of the invention is that an instruction set which can selectively expand the instruction code length at a unit of the predetermined number of bits is used. Another feature is that an operand addressing mode and a type of operation for an operand are designated by separate predetermined number of code bits which are coded in a common coding scheme so that an instruction decoder is shared by those codes.

REFERENCES:
patent: 4087857 (1978-05-01), Joyce et al.
patent: 4162480 (1979-07-01), Berlekamp
patent: 4197578 (1980-04-01), Wada et al.
patent: 4432052 (1984-02-01), McDonough et al.
patent: 4446517 (1984-05-01), Katsura et al.
patent: 4797808 (1989-01-01), Bellay et al.
patent: 4807113 (1989-02-01), Matsumoto et al.

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