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:
Jun. 17, 2003
Filed:
Jun. 21, 2000
Denso Corporation, Kariya, JP;
Abstract
To downsize the circuit scale of a CPU in a microcomputer capable of executing multiple interrupt, an interrupt controller includes an interrupt mask level register. The CPU temporarily transfers or stacks processing data into a RAM. The processing data include a PSR (i.e., system register) value and a PC (i.e., program counter) value of the interrupt processing presently running in CPU. At the same time, the CPU sends a stack signal “STK” to the interrupt controller. In response to the stack signal “STK”, the interrupt controller temporarily transfers the interrupt mask level stored in the register into the RAM. When the CPU restarts the suspended interrupt processing, the CPU reads the PSR value and the PC value from the RAM while the CPU produces a return signal “RTN.” In response to the return signal “RTN”, the interrupt mask level is returned from the RAM to the register.