USDJPY might be forming a cycle top at 81.47 on daily chart. Deeper decline to test 79.57 key support would likely be seen next week, a breakdown below this level will indicate that the downtrend from 85.51 has resumed, then further fall to 78.00 could be seen.
For long term analysis, USDJPY is in consolidation of long term downtrend from 124.16 (2007 high). Range trading between 76.40 and 90.00 is expected in next several months.