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Location：Home > Questions > Energy Metering IC > Rn8209x (C \ D \ g) rn8208g rn8207c read operation, since there is no check byte in the frame format, how to ensure that the read data is the correct

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Rn8209x (C \ D \ g) rn8208g rn8207c read operation, since there is no check byte in the frame format, how to ensure that the read data is the correct

Author：IRD    Time：2022.11.24    Hits：-

Answer: the data read back from the SPI / UART port of the register address 44h rdata last time is used. After reading back a register 

data each time, the comparison of the values of the 44h rdata is read back. Only when the data is identical, can it be read effectively. 

If the data read back two times is different, the data read back is invalid and the register needs to be read again.

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