TOKYO, Dec. 10 (Xinhua) -- Tokyo stocks ended mixed Wednesday, as buying of exporter shares on a weaker yen was offset by selling ahead of the U.S. Federal Reserve's policy meeting decision.

The benchmark Nikkei stock index, the 225-issue Nikkei Stock Average, ended down 52.30 points, or 0.10 percent, from Tuesday to 50,602.80.

The broader Topix index, meanwhile, finished 4.10 points, or 0.12 percent, higher at 3,389.02, after hitting an intraday all-time high.

The U.S. dollar remained firm in the upper 156 yen range in Tokyo. The yen's weakness lifted exporter shares on the stock market, with the benchmark Nikkei briefly rising above 51,000, analysts said.

However, heavyweight technology issues erased earlier gains and turned lower as a cautious mood prevailed, as investors widely expect the Fed to reduce its benchmark rate for the third straight meeting. ■