Microprocessor ALU with absolute value function

Details Microprocessor ALU with absolute value function Microprocessor ALU with absolute value function

1980-11-24

1983-12-20

Boudreau, Leo H.

Boots, shoes, and leggings

G06F 738

Patent

active

044221436

ABSTRACT:
A single-chip microprocessor device of the MOS/LSI type contains an ALU, several internal busses, a number of address/data registers, and an instruction register with associated control decode or microcontrol generator circuitry. The device communicates with external memory and peripherals by a bidirectional multiplexed address/data bus and a number of control lines. The ALU circuit is constructed to modify the carry-generate term so that the twos-complement function (and others) can be generated for either of the ALU inputs. By then connecting the most significant bit of the input to the arithmetic/logic control of the ALU, the absolute value function is generated. This results in faster signed multiply and divide instructions with less circuitry.

REFERENCES:
patent: 4144563 (1979-03-01), Heuer et al.
patent: 4161784 (1979-07-01), Cushing et al.
patent: 4188668 (1980-02-01), Finlay
patent: 4228498 (1980-10-01), Moshier

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