System and method for executing branch on bit set/clear instruct

Details System and method for executing branch on bit set/clear instruct System and method for executing branch on bit set/clear instruct

1994-03-07

1995-04-25

Lall, Parshotam S.

G06F 930

Patent

active

054106605

ABSTRACT:
A data processing system (10) executes a branch instruction in a straight line microcode sequence. During execution of the instruction, a control unit (56) is provided to decode the instruction to provide a plurality of control signals and to determine a data value with which to test a condition of the instruction. A constants generation circuit (222) generates a mask value in response to the plurality of control signals. An arithmetic logic unit (224) logically combines the mask value with the data value to produce a masked value. A zero detect circuit (246) subsequently tests the masked value to determine if it is equal to zero and provides a condition signal to indicate if the condition of the instruction was satisfied. If the condition of the instruction is satisfied, an offset value plus one is added to a program counter value. Otherwise, the program counter value is incremented by one.

REFERENCES:
patent: 4334268 (1982-06-01), Boney et al.
patent: 4338661 (1982-07-01), Tredennick et al.
patent: 4370729 (1983-01-01), Bosch
patent: 4429361 (1984-01-01), Maccianti et al.
patent: 4766531 (1988-08-01), Huntsman et al.
patent: 4777587 (1988-10-01), Case et al.
patent: 4837681 (1989-06-01), Fuller
patent: 4876640 (1989-10-01), Shankar et al.
patent: 4891754 (1990-01-01), Boreland
patent: 4907192 (1990-03-01), Kaneko
patent: 4933897 (1990-06-01), Shankar et al.
patent: 4947369 (1990-08-01), Thoma et al.
patent: 5142630 (1992-08-01), Ishikawa
patent: 5203006 (1993-04-01), Taniai
patent: 5210833 (1993-05-01), Kaneko
"68HC11 Reference Manual" published by Motorola, Inc. in 1989, pp. A-14, A-16 through A-20, A-23, A-25 through A-29, A31, A-33.

Affiliated with

Also associated with

Rating

System and method for executing branch on bit set/clear instruct does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System and method for executing branch on bit set/clear instruct, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for executing branch on bit set/clear instruct will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1574113