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Power-saving with C8051F310

Hi.
Which is the most power-saving-mode for the C8051F310 uC?
Until now i throttle the oscillator down to SYSCTL/8(~3MHz) and switch the CPU to IDLE-Mode. But the datasheet explains, that it already takes about 155 uA in IDLE-mode at 1MHz. Thats still too much for my application.
I dont have space left for an external oscillator on my board, so switching to a lower frequency isn't possible.
It shall go in sleep-mode and wait until an external interrupt occurs. Then it computes a little and goes to sleep again, until the next external interrupt occurs or the command of waking up arrives.
It should not take more than 10-15uA in sleep-mode.
Is this possible with this device?

Many thanks in advance.
Manuel

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