Main Oscillator Circuit Examples - Samsung S3C2416 User Manual

S3C2416X RISC MICROPROCESSOR
CLKSRC[8] (register)
0
0
1
1
Loop filter capacitance
Fin
Fout
External capacitance used for X-tal
Feedback Resistor used for X-tal
Table 2-3. Clock Source Selection for the EPLL
CLKSRC[7] (register)
X
X
0
1
Table 2-4. PLL & Clock Generator Condition
C
LF
-
-
C
EXT
R
F
Figure 2-4. Main Oscillator Circuit Examples
OM[0] EPLL Reference Clock
0
1
X
X
MPLLCAP : N/A
EPLLCAP : Typical 1.8nF 5%
MPLL: 10 − 30 MHz
EPLL: 10 − 40 MHz
MPLL: 40 − 1600 MHz
EPLL: 20 − 600 MHz
15 pF
1MΩ
SYSTEM CONTROLLER
XTI
EXTCLK
XTI
EXTCLK
2-7