The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 1984
Filed:
Nov. 30, 1981
Joel R Oberman, Somerville, NJ (US);
Russell G Ott, Cranford, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
In a data processing system having a memory and employing N-bit bytes and two byte addresses, a branch instruction which can cross one page boundary is executed without having to use calculations to effect a change in the contents of the program counter (PC). It is determined whether the value V1 of the (N-1) least significant bits (LSB's ) of the lower order byte of the two byte branch address is greater or less than the value V2 of the (N-1) least significant bits (LSB's) of the lower order byte of the address to which the PC is pointing and also whether PC N.noteq.BR N where PC N and BR N are the most significant bits of the lower order bytes of the PC address and the branch address, respectively. If V1<V2, PC N=1, and PC N.noteq.BR N, the upper order byte of the PC address is incremented by 1 and if V1>V2, PC N=0, and PC N.noteq.BR 7, the upper order byte of the PC address is decremented by 1.