Laptop User Manual

S3C2440A RISC MICROPROCESSOR ELECTRICAL DATA
27-9
A.C. ELECTRICAL CHARACTERISTICS
1/2 V DD
1/2 V DD
t XTALCYC
NOTE: Clock input is from the X TIpll pin.
Figure 27-2 XTIpll Clock Timing Diagram
t EXTHIGH
V IH
1/2 V DD
V IL V IL
V IH
V IH
1/2 V DD
t EXTLOW
t EXTCYC
NOTE: Clock input is from the EXTCLK pin.
Figure 27-3 EXTCLK Clock Input Timing Diagram
HCLK
(internal)
EXTCLK
t EX2HC
Figure 27-4 EXTCLK/HCLK in case when EXTCLK is used without the PLL