Patents by Inventor Tsutomu Kamiyoshi

Tsutomu Kamiyoshi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Semiconductor integrated circuit having improving program recovery capabilities
    Patent number: 7103738
    Abstract: A backup memory, a DMA (direct memory access) controller, and a WDT (watch dog timer) are provided in addition to a CPU (central processing unit), a RAM (random access memory), and a peripheral circuit. The DMA controller exercises control so that respective data of the CPU, RAM and peripheral circuit is saved in the backup memory each time the CPU, being under normal operation, supplies a counter reset signal to the WDT, and so that the data that has been saved in the backup memory is restored to the CPU, the RAM and the peripheral circuit, respectively, if the WDT has detected a program runaway and outputted a time-over signal. Therefore, even in a case where a program runaway has occurred in the CPU, normal operation is permitted to be resumed from midway in the program.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: September 5, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takashi Yoneda, Tsutomu Kamiyoshi, Hiroshi Benno, Shirou Yoshioka, Tsuneo Uenishi
  • Semiconductor integrated circuit
    Publication number: 20040037156
    Abstract: A backup memory, a DMA (direct memory access) controller, and a WDT (watch dog timer) are provided in addition to a CPU (central processing unit), a RAM (random access memory), and a peripheral circuit. The DMA controller exercises control so that respective data of the CPU, RAM and peripheral circuit is saved in the backup memory each time the CPU, being under normal operation, supplies a counter reset signal to the WDT, and so that the data that has been saved in the backup memory is restored to the CPU, the RAM and the peripheral circuit, respectively, if the WDT has detected a program runaway and outputted a time-over signal. Therefore, even in a case where a program runaway has occurred in the CPU, normal operation is permitted to be resumed from midway in the program.
    Type: Application
    Filed: August 26, 2003
    Publication date: February 26, 2004
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takashi Yoneda, Tsutomu Kamiyoshi, Hiroshi Benno, Shirou Yoshioka, Tsuneo Uenishi