s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 229
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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S3C2410A
NORMAL Mode
In normal mode, all peripherals and the basic blocks including power management block, the CPU core, the bus
controller, the memory controller, the interrupt controller, DMA, and the external master may operate fully. But, the
clock to each peripheral, except the basic blocks, can be stopped selectively by software to reduce the power
consumption.
IDLE Mode
In IDLE mode, the clock to the CPU core is stopped except the bus controller, the memory controller, the interrupt
controller, and the power management block. To exit the IDLE mode, EINT[23:0], or RTC alarm interrupt, or the other
interrupts should be activated. (EINT is not available until GPIO block is turned on).
SLOW Mode (Non-PLL Mode)
Power consumption can be reduced in the SLOW mode by applying a slow clock and excluding the power
consumption from the PLL. The FCLK is the frequency of divide_by_n of the input clock (XTIpll or EXTCLK) without
PLL. The divider ratio is determined by SLOW_VAL in the CLKSLOW control register and CLKDIVN control register.
In SLOW mode, PLL will be turned off to reduce the PLL power consumption. When the PLL is turned off in the
SLOW mode and the user changes power mode from SLOW mode to NORMAL mode, the PLL needs clock
stabilization time (PLL lock time). This PLL stabilization time is automatically inserted by the internal logic with lock
time count register. The PLL stability time will take 150us after the PLL is turned on. During PLL lock time, the FCLK
becomes SLOW clock.
SLOW_VAL
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Table 7-3. CLKSLOW and CLKDIVN Register Settings for SLOW Clock
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
XTIpll / 10
XTIpll / 12
XTIpll / 14
XTIpll / 1
XTIpll / 2
XTIpll / 4
XTIpll / 6
XTIpll / 8
FCLK
(HDIVN = 0)
1/1 Option
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
XTIpll / 10
XTIpll / 12
XTIpll / 14
XTIpll / 1
XTIpll / 2
XTIpll / 4
XTIpll / 6
XTIpll / 8
HCLK
(HDIVN = 1)
1/2 Option
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
EXTCLK or
XTIpll / 12
XTIpll / 16
XTIpll / 20
XTIpll / 24
XTIpll / 28
XTIpll / 2
XTIpll / 4
XTIpll / 8
(PDIVN = 0)
1/1 Option
HCLK
HCLK
HCLK
HCLK
HCLK
HCLK
HCLK
HCLK
PCLK
CLOCK & POWER MANAGEMENT
(PDIVN = 1)
1/2 Option
HCLK / 2
HCLK / 2
HCLK / 2
HCLK / 2
HCLK / 2
HCLK / 2
HCLK / 2
HCLK / 2
48 MHz
48 MHz
48 MHz
48 MHz
48 MHz
48 MHz
48 MHz
48 MHz
UCLK
7-11
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