Write to register CCU6_CC60SRL ?

Hi,

I am trying to write to the CCU6_CC60SRH/L registers:

CCU6_PAGE = 0x00; // switch to page 0
CCU6_CC60SRL |= 0x00;
CCU6_CC60SRH |= 0x60;

These registers allows me to change the duty cycle for my PWM signal.

Writing with the above sequence does nothing.

Using Infineon XC866 micro, Keil u3 toolset.