U.S. dollar against the yen rose to a 20-month high of 84.61 yen, a breakthrough in 84.50 option barriers, triggering stop-loss buying at the department level above the U.S. dollar against the yen at 84.39 yen latest rose 0.23%. Traders said the U.S. dollar against the file an exercise price of yen options short days have stable buying yen reflects the possibility of a further decline.