6 CLOCK MANAGEMENT UNIT (CMU)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
6-19
10.4 LCDC Clock (OSC3 Division Ratio) Selections
Table 6.
LCLKDIV[4:0]
Division ratio (OSC3/n)
LCLKDIV[4:0]
Division ratio (OSC3/n)
0x1f
1/32
0xf
1/16
0x1e
1/31
0xe
1/15
0x1d
1/30
0xd
1/14
0x1c
1/29
0xc
1/13
0x1b
1/28
0xb
1/12
0x1a
1/27
0xa
1/11
0x19
1/26
0x9
1/10
0x18
1/25
0x8
1/9
0x17
1/24
0x7
1/8
0x16
1/23
0x6
1/7
0x15
1/22
0x5
1/6
0x14
1/21
0x4
1/5
0x13
1/20
0x3
1/4
0x12
1/19
0x2
1/3
0x11
1/18
0x1
1/2
0x10
1/17
0x0
1/1
(Default: 0x7)
Clock Control Register (CMU_CLKCTL)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
Clock Control
Register
(CMU_CLKCTL)
0x300104
(8 bits)
D7
USBREGCLK
_EN
USB I/O register clock enable
1 Enable
0 Disable
0
R/W Write-protected
D6
LCLK_EN
LCDC clock enable
1 Enable
0 Disable
0
R/W
D5
USBCLK_EN USB clock enable
1 Enable
0 Disable
0
R/W
D4
SDCLK_EN SDCLK clock enable
1 Enable
0 Disable
1
R/W
D3
BCLK_EN
BCLK clock enable (in HALT)
1 Enable
0 Disable
1
R/W
D2
PCLK2_EN PCLK2 clock enable
1 Enable
0 Disable
1
R/W
D1
PCLK1_EN PCLK1 clock enable
1 Enable
0 Disable
1
R/W
D0
GCLK_EN GCLK clock enable
1 Enable
0 Disable
1
R/W
D7
USBREGCLK_EN: USB I/O Register Clock Enable Bit
Enables or disables the USBREGCLK clock supply to the USB function controller.
1 (R/W): Enabled (on)
0 (R/W): Disabled (off) (default)
The USBREGCLK_EN default setting is 0, which stops the clock supply. Setting USBREGCLK_EN to
1 supplies USBREGCLK to the USB function controller. If no USB register access is required, stop the
clock supply to reduce current consumption.
D6
LCLK_EN: LCLK Clock Enable Bit
Enables or disables the LCLK clock supply to the LCD controller.
1 (R/W): Enabled (on)
0 (R/W): Disabled (off) (default)
The LCLK_EN default setting is 0, which stops the clock supply. Setting LCLK_EN to 1 supplies
LCLK to the LCD controller. If no LCD display is required, stop the clock supply to reduce current
consumption.
D5
USBCLK_EN: USB Clock Enable Bit
Enables or disables the USBCLK clock supply to the USB function controller.
1 (R/W): Enabled (on)
0 (R/W): Disabled (off) (default)
The USBCLK_EN default setting is 0, which stops the clock supply. Setting USBCLK_EN to 1 sup-
plies USBCLK to the USB function controller. If no USB operation is required, stop the clock supply to
reduce current consumption.