can't change the C3088 pixelclock

Hi, I'm using the C3088 cam (OV6620) together with a AVR ATmega16 microcontroller. I can read and write to the cam's registers except
for register 0x11, the Clock Rate Control register. I want to change that register in order to change the pixel clock rate. If I write to the register, and perform a read operation on it immediately after the write operation, I can see that the register has been updated. But if I perform a read operation again after a small delay, the value of the register is reset to the default value again.
Has anyone else experienced this before?
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