How is the PFD Mode setup?
• Set FPFD ([2Eh].7) to 1 to select the 3.58MHz/4 as PFD clock source, while set the FPFD to 0 to select the 32768Hz as PFD clock source. In the Green Mode and Sleep Mode, only the 32768Hz clock source is available. • Set the prescaler division ratio (PRES1~PRES0)=n by the formual fIN=PFD clock source / 2n • Set the PFDEN=1 to enable the PFD • Set the PFDD register with division value m (ranging from 0 ~255) ; the PFD output frequency formula is fPFD = FIN /(2 x (m+1)). After these steps are taken, the MUSIC pin will have the PFD output. If set FPDEN=0 will turn off the PFD, clear the PFDD contents to 0 automatically, and MUSIC pin output low. Please note that if FPDEN=0, i.e. the PFD is off, the PFDD contents cannot be modified.
