USD/TWD falls slightly

USD/TWD falls slightly to 33.795 vs 33.800 at both midday, last close on exporter sales near end of month, Taiex's 3.3% gain. "But the pair (would have fallen) more without (U.S. dollar) buying by the central bank," says foreign bank trader. Notes central bank suspected of having bought USD to help export sector, given recent sharp gains in TWD vs U.S. currency. Tips 33.750-33.820 range rest of session with central bank likely to continue to try to prevent a steep TWD rise.