Abstract

An EEPROM apparatus being provided with, in an ECC circuit (6), an ECC code generating unit (19) which automatically generates "5(H)" ((H) represents hexadecimal number), that is, "0101(B)" ((B) represents binary number) as the ECC code when data, in which head is 37 1" and thereafter "0" and "1" are repeated in binary notation, for example, "55(H)", that is, "01010101(B)" is written, as the data to be stored in an EEPROM 50, and automatically generates "A(H)", that is, "1010(B)" as the ECC code when data, in which head is "0" and thereafter "1" and "0" are repeated in binary notation, for example, "AA(H)", that is, "10101010(B)" is written, and capable of executing checker pattern test easily and in a short time.

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