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const int position = 0;
const QString sectorName = "SA";
const quint32 startAddress = 0;
//tableWidget->columnCount() == 5;
//------------------------------

tableWidget->insertRow(position);//Создаём 0-ю строку в таблице

QTableWidgetItem * item = new QTableWidgetItem (sectorName);
tableWidget->setItem(position/*стр.*/, 0/*стлбц.*/, item);
const QString debug0 = tableWidget->itemAt(position, 0)->text();

item = new QTableWidgetItem (tr("0x") + QString::number(startAddress,16));
tableWidget->setItem(position, 1, item);
const QString debug1 = tableWidget->itemAt(position, 1)->text();
//...