mdk 3.4 problem

When I use MDK 3.4 and input following:
PINSEL2 = PINSEL2 & ( ~( 0x3<<4 )) | ( 1<<4 ) //enable CS0, OE, D0...D7, D8...D15 & ( ~(0x3<<26 )) | ( 1<<25 ) //enable Addr2 as NAND flash ALE //enable Addr3 as NAND flash CLE | ( 1<<8 ); //enable WE
PINSEL2 =0x026001D4
when I change it by following:
PINSEL2 = PINSEL2 & ( ~(0x3<<26 )) | ( 1<<25 ) //enable Addr2 as NAND flash ALE //enable Addr3 as NAND flash CLE | ( 1<<8 ); //enable WE
// & ( ~( 0x3<<4 ))
// | ( 1<<4 ); //enable CS0, OE, D0...D7, D8...D15
PINSEL2 =0x026001F4
The second code is NXP DEMO code.I use it,but it works wrong.I write it " the first code",it works right.Where the problem is?

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