Exchange Rate Question

It seems to me as though in some areas of the text the book says that a country with higher nominal interest rates will experience depreciation relative to a country with lower nominal interest rates, and in some areas, it says that they will experience appreciation. Am I just reading this wrong? Before, my understanding was that if nominal interst rates were higher, depreciation would result, and if real interest rates were higher, appreciation would result. Anyone have this concept down and can explain it to me? Thanks