MEMORY CHECKING METHOD

PURPOSE:To attain normal action of a memory by writing and reading data when a power source is entered or the memory is cleared and calling and checking data when the power source is restored or reset. CONSTITUTION:When the power source is entered or the memory is cleared, a processor 1 writes the p...

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Bibliographic Details
Main Authors MIYAZAKI SHIGEYUKI, NAGASAWA TOSHINORI, DOI HIROYUKI
Format Patent
LanguageEnglish
Published 07.03.1987
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:PURPOSE:To attain normal action of a memory by writing and reading data when a power source is entered or the memory is cleared and calling and checking data when the power source is restored or reset. CONSTITUTION:When the power source is entered or the memory is cleared, a processor 1 writes the prescribed data M at the prescribed address in the memory RAM 3, then reads the data M, and recognizes and checks whether data is equal or not. At power failure, a power failure detecting circuit 5 detects the power failure, and backs up the contents in the memory RAM 3 by a backup power source included in a power source circuit 4. When the backup is released after the power restoration, a CPU 1 calls the data M at the prescribed address in the memory RAM 3, and recognizes whether the data M stored at the address are destructed or not. At the time of resetting the CPU 1, checking is made in the same manner as power restoration.
Bibliography:Application Number: JP19850191769