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PRELIMINARY
S3C6400X RISC MICROPROCESSOR
SYSTEM CONTROLLER
3-29
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.
Clock output configuration register
Internal clocks can be monitored through GPIO port, which is GPIO port-F. CLK_OUT register selects an internal
clock among PLL output, HCLK, 48MHz, 27MHz, RTC, and TICK. It also divides the selected clock.
REGISTER
ADDRESS
R/W
DESCRIPTION
RESET VALUE
CLK_OUT 0x7E00_F02C
R/W
Select clock output
0x0000_0000
CLK_OUT
BIT
DESCRIPTION
RESET VALUE
RESERVED [31:20]
RESERVED
0x000
DIVVAL [19:16]
Divide ratio (Divide ratio = 1). If this field has not
0, DCLKCMP has no meanng. Therefore, DOUT is always
50% duty ratio when DIVVAL > 0.
0x0
RESERVED [15]
RESERVED
0
CLKSEL [14:12]
000 = FOUT
APLL
/2
001 = FOUT
EPLL
010 =HCLK
011 =CLK48M
100 =CLK27M
101 =RTC
110 =TICK
111 =DOUT
0x0
DCLKCMP [11:8]
This field changes the clock duty of DCLK. Thus, it must be
smaller than DCLKDIV. It is valid only when CLKSEL is
3’b111.
If the DCLKCMP is n, low level duration is (n+1).
High level duration is ((D 1) – (n+1))
0x0
DCLKDIV [7:4]
DCLK divide value
DCLK frequency = source clock / (D 1)
0x0
RESERVED [3:2]
RESERVED 0x0
DCLKSEL
[1]
Select DCLK source clock (0: PCLK, 1: 48MHz)
0
DCLKEN
[0]
Enable DCLK (0:disable, 1:enable)
0