The clock module explains: when setting the clock, the M8015 should be set and restores the M8015 reset. D8018 is for year, D8017 is month, D8016 is day, D8019 is week, D8015 is hour, D8014 is minute, D8013 is second. The clock data can be read by the clock data TRD to read the clock data to the general register, or to modify the clock with the clock writing instruction TWR, using this instruction without the position M8015