Rainbow Electronics AT89C51SND1C - Manual (Page 14)

14
AT8xC51SND1C
4109E–8051–06/03
Figure 9. PLL Filter Connection
PLL Programming The PLL is programmed using the flow shown in Figure 10. As soon as clock generation
is enabled, the user must wait until the lock indicator is set to ensure the clock output is
stable. The PLL clock frequency will depend on MP3 decoder clock and audio interface
clock frequencies.
Figure 10. PLL Programming Flow
VSS
FILT
R
C1
C2
VSS
PLL
Programming
Configure Dividers
N6:0 = xxxxxxb
R9:0 = xxxxxxxxxxb
Enable PLL
PLLRES = 0
PLLEN = 1
PLL Locked?
PLOCK = 1?