By Tess Stynes 
 

Atmel Corp's (ATML) swung to a fourth-quarter loss as the chip maker was hurt by losses related to a foundry arrangement, restructuring-related charges and other items, as well a decline in revenue.

Shares fell 1.7% to $7.02 in after-hours trading. Through the close, the stock is up 9% this year.

The company's products include controllers used in computing and other applications, as well as touchscreens used in smartphones and other devices--a key growth area.

Atmel in November said that it expected continued growth in its microcontroller business and the launch of Microsoft Corp.'s (MSFT) Windows 8, where its has a number of design wins, would provide growth drivers in the latest quarter and during 2013.

Atmel reported a loss of $12.3 million, or three cents a share, compared with a year-earlier profit of $32.9 million, or seven cents a share, a year earlier. Excluding losses related to a foundry arrangement, restructuring-related costs and other items, adjusted earnings were down at seven cents from 14 cents. Analysts polled by Thomson Reuters most recently projected earnings of seven cents.

Revenue decreased 10% to $345.1 million. The company in November forecast $328 million to $352 million.

Gross margin fell to 38.1% from 48.1%. Excluding items, gross margin was down at 41.6% from 48.7%.

Write to Tess Stynes at tess.stynes@dowjones.com

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