TOKYO (Kyodo) -- Tokyo stocks were mixed Wednesday morning, weighed down by selling amid uncertainty over planned U.S. reciprocal tariffs, while gains by some technology issues supported the market.

The 225-issue Nikkei Stock Average rose 15.33 points, or 0.04 percent, from Tuesday to 35,639.81. The broader Topix index was down 17.10 points, or 0.64 percent, at 2,644.63.

The U.S. dollar remained mostly unchanged in the upper 149 yen range in Tokyo as traders adopted a wait-and-see stance before U.S. President Donald Trump's expected announcement of the details of the reciprocal tariffs, dealers said.

At noon, the dollar fetched 149.78-82 yen compared with 149.58-68 yen in New York and 149.62-64 yen in Tokyo at 5 p.m. Tuesday.

The euro was quoted at $1.0794-0795 and 161.67-73 yen against $1.0787-0797 and 161.44-54 yen in New York and $1.0800-0802 and 161.60-64 yen in Tokyo late Tuesday afternoon.

On the stock market, investors remained cautious before the U.S. announcement Wednesday of the reciprocal levies that could go into effect immediately, with an additional auto tariff set to take effect as scheduled on Thursday.

But the benchmark Nikkei was supported by heavyweight semiconductor-related shares that tracked rises by their U.S. counterparts on the Nasdaq index.