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LPC932:baudrate generator interfere with I2C clock ?

I meet a confusing problem...
I have to use UART & IIC communication simultaneously.
The internal SCL generator is selected for the I2C clock. data rate is 100Kbit/sec at fosc=12MHz.
Baudrate generator is selected for UART clock. 9600bps is set.
The problem is that IIC works incorrectly if baudrate generator for UART is set enable. It always halts after transmitting/receiving one or two bytes of data and can't finish whole communication properly.
How to solve this problem ?

Thanks...

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