Semiconductor integrated circuit having improving program...

Details Semiconductor integrated circuit having improving program... Semiconductor integrated circuit having improving program...

2006-09-05

2006-09-05

Lane, Jack A. (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C714S051000, C714S055000

Reexamination Certificate

active

07103738

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.

REFERENCES:
patent: 6-131218 (1994-05-01), None

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