Non-volatile counter

Abstract From the Canadian patent

A counter includes an array of memory cells arranged in groups of memory cells, each group designating a counting decade. Each group of memory cells includes first and second word strings each capable of storing a data , word, and a fault flag, capable of indicating which word string contains the data word. Sensing, means is coupled to the memory array for checking the status of the memory cells and, for generating fault signals upon detection of a fault in a memory cell. Logic means is, coupled to the memory cells and to the sensing means for selecting the first or second, word string in response to a fault signal wherein upon detection of a fault , in a first word string, the data …