PDD method parameters start with the base address of the peripheral. If user is writing a code which is using a peripheral initialized by the existing component, it is recommend to use the value {component_name}_DEVICE which gets replaced by the appropriate address of the selected peripheral for the component. This is automatically done when you drag and drop the PDD method from the PDD sub-folder of the Peripheral Initialization component.
Figure 1. Peripheral Base Address
Otherwise, the peripheral base addresses can be found in the IO_Map.h file.