SEMICONDUCTOR INTEGRATED DEVICE, AND IC CARD AND PORTABLE INFORMATION TERMINAL USING THE SEMICONDUCTOR INTEGRATED DEVICE

摘要

A highly reliable semiconductor integrated device which can detect insufficient erasing and writing generated while a nonvolatile memory is being updated, and an IC card and a portable information terminal using such semiconductor integrated device are provided. A nonvolatile memory (904) having a memory cell group (1001) divided into a plurality of blocks is provided, a flag (1011) is added to a data row (1010) of the block, and the flag is erased or written or erased and written each time the data row is erased or written or erased and written. Two types of set constant currents are applied to the memory cell of the flag, and at that time, a flag judging part (1007) judges whether the erasing or writing or the erasing and writing are normal or abnormal by using the voltage applied by the memory cell. Data wherein an abnormality is detected is re-erased or rewritten or re-erased and re-written to provide normal data.