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S3C2416X RISC MICROPROCESSOR
SYSTEM
CONTROLLER
2-27
The CLKDIV0 configures the division ratio of each clock generator. The operating speed of ARM can be slow to
reduce the overall power dissipation, if software doest not require full operating performance. In this case, the
power dissipation due to the ARM core can be reduced if the DVS field is ON. The set of DVS field makes that the
operating frequency of ARM is the same as system operating clock (HCLK).
CLKDIV0
Bit
Description
Initial Value
RESERVED [31:14] -
0x0
DVS [13]
Enable/disable DVS (Dynamic Voltage Scaling) feature
0 = Disable
1 = Enable (The frequency of ARMCLK is the same frequency of
HCLK regardless of ARMDIV field.)
0
RESERVED [12]
-
0
ARMDIV [11:9]
ARM clock divider ratio
ARMDIV values are recommended as below.
1/1 = 3'b000
1/2 = 3'b001
1/3 = 3'b010
1/4 = 3'b011
1/6 = 3'b101
1/8 = 3'b111
0x0
EXTDIV [8:6]
External clock divider ratio
ratio = (MPLL reference clock) / (EXTDIV*2 + 1)
0
PREDIV [5:4]
Pre Divider for HCLK
PREDIV value should be one of 0,1,2,3
Output frequency of PREDIVIDER should be less than 266MHz
0
HALFHCLK [3]
HCLKx1_2(SSMC) clock divider ratio, 0 = HCLK, 1 = HCLK/2
User also has to configure SSMC’s special register which related
with half clock.
1
PCLKDIV [2]
PCLK clock divider ratio, 0 = HCLK, 1 = HCLK / 2
1
HCLKDIV [1:0]
HCLK clock divider ratio
HCLKDIV value should be one of 0,1,3. (2'b10 is invalid)
0x0
ARMCLK Ratio = (1).
HCLK Ratio = (1) * (H 1)
Restrictions about changing ARMDIV register.
1. Be careful that ARMCLK should be equal or faster than HCLK. (X times, X is integer)
2. Change PREDIV, HCLKDIV field after 12 HCLK periods as soon as nRESET is released.
Basically, Changing ARMDIV and HCLKDIV simultaneously is supported. When modifying ARMDIV, PREDIV and
HCLKDIV, User should pay attention to obey upper No 1 restriction.
Summary of Contents for S3C2416
Page 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Page 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Page 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Page 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Page 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Page 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Page 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Page 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Page 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Page 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Page 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...