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. 23, 1996
Filed:
May. 25, 1994
Shigeo Mizugaki, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
To speed up switch between the use of a data bus by CPU for reading and writing data and the use of the data bus for refreshing a DRAM in a microcomputer having a DRAM refresh function, a terminal count signal 20 which is activated by a refresh timer 9 when a memory subsystem 8 composed of an external DRAM needs to be refreshed is directly input into a microinstruction sequencer 15 for controlling the order of executing a set of microinstructions of CPU 2. Therefore, CPU 2 can interrupt the execution of a set of microinstructions to execute a refresh cycle and can resume the execution of the interrupted set of microinstructions as controlled by the microinstruction sequencer 15 after the refresh cycle is finished.