Central processing unit with switchable carry and borrow flag

Details Central processing unit with switchable carry and borrow flag Central processing unit with switchable carry and borrow flag

1993-02-23

1995-06-06

Bowler, Alyssa H.

Boots, shoes, and leggings

364736, 3642328, 3642580, 3642591, 364DIG1, G06F 900, G06F 9302

Patent

active

054230527

ABSTRACT:
For obtaining a central processing unit to perform, with the same operation code, an operation in which a carry input is effective and an operation in which the carry input is invalid or an operation in which a borrow input is effective and an operation in which the borrow input is invalid, between an output of a carry and borrow flag and a carry and borrow input of an ALU there is provided a switching circuit to switch the input of the ALU by a control signal different from a control signal of the central processing unit due to an operation code.

REFERENCES:
patent: 4323981 (1982-04-01), Nakamura
patent: 4774688 (1988-09-01), Kobayashi et al.
patent: 4811266 (1989-03-01), Woods et al.
patent: 4839846 (1989-06-01), Hirose
patent: 4872131 (1989-10-01), Kubota et al.
patent: 4901268 (1990-02-01), Judd

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