Patent ID: 6095411
Filing Date: 2000-08-01
Classification: G06Q,G07F

Abstract:
A method for recharging an electronic debit card for cashless clearing transactions, which comprises:providing an integrated semiconductor circuit device with at least one address and control logic circuit and a non-volatile memory;providing the non-volatile memory with at least one erasable part and a region with memory locations for storing respective debit card value units, each divided into subregions of different significance;simultaneously erasing the memory locations only for all of the memory locations of a subregion of specific significance;erasing each subregion only after writing a carry value into a previously empty memory location of a subregion of next highest significance;assigning release values to be stored to the value units of at least the memory locations of the most significant subregion in a debit card release register;representing with the release values one of a release state and a blocking state for a respectively assigned value unit of the memory locations of the at least most significant subregion; andraising a total value of the debit card only by changing the release value assigned to the value unit of a memory location, from the blocking state into the release state.