Data processor having two types of carry flags

Details Data processor having two types of carry flags Data processor having two types of carry flags

1979-03-05

1981-01-13

Malzahn, David H.

Boots, shoes, and leggings

364782, 364785, G06F 750

Patent

active

042453275

ABSTRACT:
Two flip-flops for carry information are provided in a data processor; one for carry of arithmetic operation and the other for carry occuring when a program counter is incremented. A state of the latter flip-flop provides a condition of a conditional branch instruction. With the provision of those flip-flops, a multidigit operation can be performed without increasing programsteps to save carry information attendant on the operation data. A simple program may be prepared without increasing hardware for skip instruction processing.

REFERENCES:
patent: 3939335 (1976-02-01), Brantingham et al.
patent: 3956620 (1976-05-01), Brantingham et al.
patent: 4037090 (1977-07-01), Raymond, Jr.
patent: 4125867 (1978-11-01), Cochran
TMS 1000 Series MOS/LST One-Chip Microcomputers, Programmer's Reference Manual, Texas Instruments Asia Limited, p. 1-6 & p. 12-2.
P.P.S. 411 Single Circuit Microcomputer Series, Programming Manual, RockwellInternational, p. 1-2 & p. 3-33.

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