s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 224
s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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CLOCK & POWER MANAGEMENT
CLOCK CONTROL LOGIC
The clock control logic determines the clock source to be used, i.e., the PLL clock (Mpll) or the direct external clock
(XTIpll or EXTCLK). When PLL is configured to a new frequency value, the clock control logic disables the FCLK until
the PLL output is stabilized using the PLL locking time. The clock control logic is also activated at power-on reset
and wakeup from power-down mode.
Power-On Reset (XTIpll)
Figure 7-4 shows the clock behavior during the power-on reset sequence. The crystal oscillator begins oscillation
within several milliseconds. When nRESET is released after the stabilization of OSC (XTIpll) clock, the PLL starts to
operate according to the default PLL configuration. However, PLL is commonly known to be unstable after power-on
reset, so Fin is fed directly to FCLK instead of the Mpll (PLL output) before the software newly configures the
PLLCON. Even if the user does not want to change the default value of PLLCON register after reset, the user should
write the same value into PLLCON register by software.
The PLL restarts the lockup sequence toward the new frequency only after the software configures the PLL with a
new frequency. FCLK can be configured as PLL output (Mpll) immediately after lock time.
7-6
nRESET
Disable
(XTIpll)
Figure 7-4. Power-On Reset Sequence (when the external clock source is a crystal oscillator)
Power
output
Clock
FCLK
OSC
VCO
The logic operates by XTIpll
PLL can operate after OM[3:2] is latched.
PLL is configured by S/W first time.
Lock Time
VCO is adapted to new clock frequency.
FCLK is new frequency
S3C2410A
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