Lpc2000

Hi all.
I want to use I2C bus on LP2294, I initialize bus, set the baud rate
(I2C_I2SCLL = 50;I2C_I2SCLH = 50;//BR=24000kHz/100=240kBd) and now I
want to set slave address, SCL go low, SDA stays in high, I set STA in
SET register (I2C_I2CONSET = STA) and I wait, while I2C_I2STAT!=0x08.
Next I set slave address, clear I2C interrupt bit, I am using I2C
interrupt, the interrupt frequently occurs with I2_I2STAT=0x30,
I2C_CONSET=0x48 and SCL don't want to oscilate. When may be problem,
please help. Thanks.