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I2C Master code for LPC2148

I downloded the application note from Philips site viz.
AN10369_1.pdf, in which I2C master code is given (interrupt based). I have some problems with its clock.
In the application note ,

they have mentioned directly

bit freq = pclk/(I2CSClkH + I2CSClkL)

so if my pclk is (cpuclk/4)i.e. 60/4 =15 MHz
then for bit frequency of 100 KHz I am getting
(I2CSClkH + I2CSClkL) tas 150.
But after execution i am not getting the 100 KHz clock. I used pull up resistors of 4.7 K on SDA & SCLK pins.
Has someone gone through such application ? Please share if u faced the similar kind of application.
thanks

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