After six months of microprocessor revenue market-share losses, Advanced Micro Devices Inc. (NYSE: AMD) managed to stabilize its share in this year's second quarter, while Intel Corp. dipped slightly, according to preliminary results from researcher iSuppli.

Sunnyvale, Calif.-based AMD saw its market share of worldwide microprocessor sales rise to 11.4 percent from 10.9 percent in the first quarter, iSuppli said on Thursday.

The firm also reported that Intel had a corresponding decline to 80.3 percent from 80.8 percent. This ended a big resurgence in market-share during the prior two quarters for the microprocessor giant.

"The main cause of the market-share reversal of fortune was a decline in Intel's microprocessor Average Selling Prices (ASPs),' said Matthew Wilkins, principal analyst for compute platforms research at iSuppli. "This caused Intel's revenue share to decline--although its microprocessor unit shipments were up sequentially.

Though AMD was able to gain slightly in market share, the chipmaker Thursday reported a net loss of $600 million in the second quarter, or $1.09 cents per share, down from a net income of $89 million, or 18 cents per share, during the year-ago period.

Sales rose 13 to $1.37 billion, however, topping Wall Street's estimate of $1.25 billion, according to analysts polled by Thomson Financial.

In August, AMD will start shipping its long-awaited quad-core Barcelona server processor, followed by its quad-core Phenom desktop chip at a later date.

Shares in AMD fell 19 cents, or 1.20 percent in Friday mid-day trading on the Nasdaq Stock Market. Intel shares lost 64 cents, or 2.53 percent to reach $24.62.