FLASH_STATUS_BIT_MASK_DQ6
toggle_bit1 = ((nv_data1 & FLASH_STATUS_BIT_MASK_DQ6)
^ (nv_data2 & FLASH_STATUS_BIT_MASK_DQ6));
((nv_data1 & FLASH_STATUS_BIT_MASK_DQ6)
^ (nv_data2 & FLASH_STATUS_BIT_MASK_DQ6));