On my application, the line voltage should be 60 Hz. But with ADE7880, reading register APERIOD / BPERIOD / CPERIOD, the hex code always 0x1045h, sometimes 0x1046 or 0x1044, the corresponding decimal value is 4165. Using the equation on the data sheet,
frequency = 256000/4165, is around 61.46Hz. I already set SELFREQ bit at COMPMODE register to '1'. I wonder how could I correct this offset. With the device that using ADE7953, the frequency reading is 60 Hz. Please help me on this issue.