Board offset calibration with bq20z95

Hello,

I am trying to make a board offset calibration. I use your datasheet SLUA379B–May 2006–Revised January 2010.

'// WRITE BOARD OFFSET TO DATA FLASH. FROM DATA MANUAL, SUBCLASS=104, OFSET=16
1Error = WriteSMBusInteger(&H77, 104) '//Set subclass to 104
1Error = ReadSMBusByteArray(&H78, yData(), iLen) '// Read the page
yData(16) = (iBoardOffset And &HFF00) \ 256 '// Modify MS byte
yData(17) = iBoardOffset And &HFF '// Modify LS byte
1Error = WriteSMBusByteArray(&H78, yData(), iLen) '//Write page back to flash
DoDelay 0.1 '// Insure flash write is finished
End Function

Please can I have more explication about this part of algorithme ? (my iboardoffset=-250 µV)

Best regards,