XC2224L stratup issue

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Hello guys,

I want to use XC2224 micro for one of my application.As I was not familiar with this micro as an initial test I hooked up VDDPB pins of this micro to 5V and decoupled the VDDIM pins with 1uF cap.When powered I expected a HIGH(5V) at the PORST pin since it is an input pin and it has an internal pull up.But what happens is just after around 100ms the voltage at the PORST pins will drop down to 3V or so and will start to fluctuate.Also the voltage at VDDIM pin fluctuates between 1.1 and 1.4V.Wasnt my expectation of a stable HIGH at PORST pin correct?Am I doing something wromg!!?Is there any configuration to set it right?

Any help is appreciated.

Thanks,
Sonu
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