SENIOR U.S. OFFICIAL TO VISIT JAPAN AS TRADE ROW GROWS Undersecretary of State Michael Armacost will visit Tokyo next week for meetings with high-level officials that will include discussions of a growing trade row over Japanese semiconductor electronics products. He is the first high-level U.S. official to visit Japan since President Reagan announced last week plans to impose tariffs worth up to 30 mln dls on Japanese electronic goods on April 17 in retaliation for Tokyo's alleged failure to live up to a pact on microchip trade signed last September. The trip is set for April 6-8, the state department said.