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:
Jan. 31, 1984
Filed:
Jun. 08, 1981
Tiziano Maccianti, Pregnana Milanese, IT;
Vittorio Zanchi, Milan, IT;
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
Sequencer means for a microprogrammed control unit which develops consecutive addresses of microprograms, branches to subroutines with address saving and possible return to microprogram, as well as interrupting microprogram forcings with address saving of the interrupted microprograms. In order to allow the double saving of microprogram and subroutine addresses in case of concurrent interruptions and branches, the sequencer means is provided with two address generation loops each including a register. The two loops have a common portion to which they accede through a multiplexer. The first loop is further coupled to a saving register stack. While the first loop executes the saving of a microprogram address and the latching or a branch address received from the second loop, the second loop executes a first updating and related latching or interrupting microprogram address. During the following cycle, by command of the first microinstruction of the interrupting microprogram, the second loop performs a first updating and related latch of the interrupting microprogram address and the first loop saves into the register stack the branch address and performs a second updating and related latching of the interrupting microprogram address.