Atmel Corporation
       Reconciliation of GAAP Net (Loss) Income to Non-GAAP Net (Loss) Income
                        (In thousands, except per share data)
                                     (Unaudited)

                             Three Months Ended           Six Months Ended
                             ------------------           ----------------
                         June 30,  March 31,  June 30,   June 30,  June 30,
                          2009       2009       2008       2009      2008
                          ----       ----       ----       ----      ----
    GAAP net (loss)
     income             $(12,407)    3,626    (4,907)   $(8,781)   $1,881

    Special items:
    Stock-based
     Compensation expense  6,412     5,382     6,353     11,794    12,660
    Acquisition-related
     charges               3,642     5,499     6,709      9,141    10,420
    Charges for grant
     repayments              249       765       292      1,014       173
    Restructuring
     charges               2,470     2,352     8,676      4,822    36,584
    (Gain) loss on sale
     of assets                 -      (164)      810       (164)  (29,948)
    Distributor bad debt
     recovery             (1,200)   (2,000)        -     (3,200)        -
    Unsolicited M&A
     expense                   -     4,934         -      4,934         -
    Income tax effect of
     non-GAAP items          221      (322)     (658)      (101)   (1,158)
                             ---     -----     -----      -----   -------
    Total special items   11,794    16,446    22,182     28,240    28,731
                          ------    ------    ------     ------    ------
    Non-GAAP net (loss)
     income                $(613)  $20,072   $17,275    $19,459   $30,612
                           -----   -------   -------    -------   -------

    Diluted non-GAAP net
     (loss) income per
     share:
    Net (loss) income     $(0.00)    $0.04     $0.04      $0.04     $0.07
                          ======     =====     =====      =====     =====
    Non-GAAP
     weighted-average
     shares used in
     diluted non-GAAP
     net (loss) income
     per share
     calculations        450,891   467,126   459,109    467,851   456,714
                         =======   =======   =======    =======   =======


    Reconciliation of
     GAAP to non-GAAP
     shares used in
     diluted net (loss)
     income per share
     calculations:            Three Months Ended         Six Months Ended
                              ------------------         ----------------
                         June 30,  March 31,  June 30,   June 30,  June 30,
                           2009      2009      2008       2009      2008
                           ----      ----      ----       ----      ----
    Diluted weighted-
     average shares
     used in per share
     calculations
     - GAAP              450,891    456,431   445,793    450,291   450,337
    Adjusted dilutive
     stock awards for
     non-GAAP                  -     10,695       13,316          17,560          6,377
                                                          ---          ------        ------          ------          -----
        Diluted  weighted-
          average  shares  used
          in  per  share
          calculations
          -  non-GAAP                    450,891      467,126        459,109        467,851      456,714
                                                  =======      =======        =======        =======      =======