Refresh of data stored in a cross-point non-volatile memory

A method comprising:

• refreshing, by a memory controller, a first voltage value of a first memory cell in a cross-point non-volatile memory including a plurality of memory cells respectively having a voltage value set to a first threshold voltage or a second threshold voltage, the first voltage value of the first memory cell set to the first threshold voltage, and wherein the refreshing includes comparing the first voltage value of the first memory cell to a reference voltage;
• detecting, by the memory controller and after the refreshing, one or more memory cells in the plurality of memory cells that produce an error upon reading respective voltage values of the one or more memory cells;
• comparing, by the memory controller, a number of the one or more memory cells with an error threshold value;
• and
• refreshing, by the memory controller if the number of the one or more memory cells is less than the error threshold value, a second voltage value of a second memory cell in the cross-point non-volatile memory by re-writing the second threshold voltage to the second memory cell without altering the first voltage value of the first memory cell.