METHOD FOR WRITING AND READING THE CONTENTS OF A MICROCIRCUIT CARD NON VOLATILE MEMORY

摘要

The non volatile memory is organised into sectors each comprising: a data field, preserving an informative content; an identifying field, forming an access key to the sector; and a relevance field, forming a subfield of the identifying field to discriminate among several sectors of a common user identification the one whereof the data field is to be considered. Writing data in a sector consists in: a) applying in input the data to be written and the corresponding sector user identification; b) scanning the memory to search for possible sectors whereof the user identification is the same as the one applied in input; c) scanning the memory to search for an available sector; and d) writing in said available sector: the data applied in input; the user identification applied in input; and a relevance value higher than that possibly found in step b). Advantageously, if the search in step b) is fruitless, prior to step d) an indicator is posted, and is erased subsequently to step d), said indicator signalling that possibly step d) is incomplete.