Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: NXP Semiconductors (Nasdaq: NXPI) dropped 17% in intraday trading today after missing earnings expectations, issuing disappointing guidance, and lowering its forecast for the NFC market that many had hoped would invigorate growth.

So what: Second quarter non-GAAP EPS of $0.51 missed the consensus estimate of $0.52 (GAAP EPS was $0.33). Revenue of $1.1 billion was flat year-over-year.

Now what: For the third quarter, management guided non-GAAP EPS to $0.47 to $0.56, nowhere near the $0.66 consensus estimate and potentially falling short of non-GAAP EPS of $0.49 in the year-earlier quarter. In an ominous sign for the outlook beyond the third quarter, the company reduced its 2011 forecast of near-field communication chip shipments, explaining that mobile-phone operators are not expanding wireless payment systems as quickly as previously anticipated. 

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Fool contributor Cindy Johnson does not own shares of any company named above. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.