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Sleep mode issues

Hi,
I'm trying to put a STR912FAW44 processor into sleep mode but I have some troubles.
Here is my code to enter sleep mode

SCU_MCLKSourceConfig(SCU_MCLK_RTC);

SCU_EnterSleepMode();
EXECUTE_50_NOP;

SCU_MCLKSourceConfig(SCU_MCLK_PLL);

So I suceed to enter in sleep mode but I have a tsleep (time to enter sleep mode in which the processor cannot be waken up) of 20 seconds and then it's really entering sleep mode and loosing 5 mA.
Does anyone had already that problem and know how to solve it?
Thanks for any help.