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FGPIO - high Impedance during power up

Hi, I would be glad if any one can help me how to change the default high impedance state during reset/powering up of my LPC 2468 MCU. I want to make them logic 0(LOW) till I change the state in the code. My specific application is to give the o/p of GPIOs to IDT74ALVC164245PAG8 which considers high impedance of GPIOs as high (mistakenly) which eventually turns ON some special relays,which is destroying my end application.

Any help from experienced users would be appreciated.

Thanks in advance.

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