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Preliminary
ELECTRICAL DATA
S3C2451X RISC MICROPROCESSOR
29-22
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
Table 29-12. Clock Timing Constants
(VDDi= 1.3V
±
0.05V (400MHz), VDDi= TBD V
±
0.05V (533MHz), TA = -40 to 85
°
C, VDD_OP1 = 3.3V
±
0.3V)
Parameter Symbol
Min
Typ
Max
Unit
Crystal clock input frequency
f
XTAL
10 - 30 MHz
Crystal clock input cycle time
t
XTALCYC
33 - 100 ns
External clock input frequency
(1)
f
EXT
10 133
MHz
External clock input cycle time
(1)
t
EXTCYC
7.5 100 ns
External clock input low level pulse width
t
EXTLOW
3.5 - ns
External clock input high level pulse width
t
EXTHIGH
3.5 - ns
External clock to HCLK (without PLL)
t
EX2HC
5 13 ns
HCLK (internal) to CLKOUT
t
HC2CK
3.3 8.8 ns
HCLK (internal) to SCLK
t
HC2SCLK
1.9 5.8 ns
Reset assert time after clock stabilization
t
RESW
4 -
XTIpll
or
EXTCLK
PLL Lock Time
t
PLL
300 - us
Sleep mode return oscillation setting time.
(2)
t
OSC2
2
524290
XTIpll
or
EXTCLK
The interval before CPU runs after nRESET is
released.
t
RST2RUN
5 -
XTIpll
or
EXTCLK
NOTE
: (1) If does not use MPLL, External clock input range is 10MHz ~ 133MHz but if use MPLL , External clock input
range is 10MHz ~ 30MHz
(2) tOSC2 is programmable by setting the PWRSETCNT bits in Reset Count register.
tOSC2 = (PW1) * 2048