The Bank of Japan announced a minor tweak to its unconventional policy of controlling government bond yields on Tuesday, stopping short of expectations and sending the yen lower.
While most other major central banks have hiked interest rates in a bid to tame prices, the BoJ has stuck with sub-zero borrowing costs to support the world's number three economy.
Instead it has sought to keep interest rates at ultra-low levels by buying up huge quantities of government bonds in an attempt to keep a lid on yields.
In July the BoJ raised to one percent the de-facto upper limit of a tolerated band in which it allows yields to move.
A media report on Tuesday said officials might widen this as they see inflation rising and the yen tumble against the dollar but the BoJ said only that it "will conduct yield curve control with the upper bounds of 1.0 percent for those yields as a reference".
