Tokyo stocks were mixed Friday morning as semiconductor shares tracked overnight advances by their U.S. counterparts, while a sense of caution prevailed ahead of the Japanese ruling party’s leadership election later in the day. The 225-issue Nikkei Stock Average rose 39.02 points, or 0.10 percent, from Thursday to 38,964.65. The broader Topix index was down 19.92 points, or 0.73 percent, at 2,701.20. The U.S. dollar briefly climbed to the mid-145 yen range in Tokyo after U.S. long-term interest rates rose overnight on lower-than-expected U.S. weekly initial jobless claims, which indicated the …