To actualize a security protecting function in a semiconductor memory chip by comparing a password written in a register with an externally inputted password and deciding whether or not a read of data from a memory cell array is allowed.
The semiconductor storage device is constituted including the register 20 where a password can be set, a password deciding means which decides whether or not the password set in the register 20 matches an externally inputted password, and a control means which allows or inhibit a data read from the memory cell array 13 according to the decision result of the password deciding means. Then this control means allows or inhibits the data read from the memory cell array 13 according to the decision result showing whether or not the password set in the register 20 matches the externally inputted password. Thus, the security protecting function is displayed in the semiconductor storage device.
FURUSAWA KAZUNORI
ETO JUN
IZAWA KAZUTO
YUGAWA YOSUKE
KOSAKAI KENJI
