the folder ¡°STC8952_C2¡± is keil Project of STC89C52. The code you want is in this file "C2_Port.c". I think the code was trying to do two things. 1) backup the cal data of fist NVRAM_0(the good one), and printing via data on serial port. 2)copy the cal data to the second NVRAM(blank one),and then read the data from second NVRAM, pinting the data via serial port.