APPENDIX A LIST OF I/O REGISTERS
AP-A-10
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
LCDC Clock
Division Ratio
Select Register
(CMU_
LCLKDIV)
0x300103
(8 bits)
D7–5 –
reserved
–
–
–
0 when being read.
D4–0 LCLKDIV[4:0] LCDC clock division ratio select
LCLKDIV[4:0]
Division ratio
0x7 R/W Clock source =
OSC3
Write-protected
0x1f
0x1e
0x1d
0x1c
0x1b
0x1a
0x19
0x18
0x17
0x16
0x15
0x14
0x13
0x12
0x11
0x10
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
1/32
1/31
1/30
1/29
1/28
1/27
1/26
1/25
1/24
1/23
1/22
1/21
1/20
1/19
1/18
1/17
1/16
1/15
1/14
1/13
1/12
1/11
1/10
1/9
1/8
1/7
1/6
1/5
1/4
1/3
1/2
1/1
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
System Clock
Division Ratio
Select Register
(CMU_
SYSCLKDIV)
0x300105
(8 bits)
D7–5 –
reserved
–
–
–
0 when being read.
D4
MCLKDIV
MCLK clock divider select
1 1/2
0 1/1
0
R/W Write-protected
D3
–
reserved
–
–
–
0 when being read.
D2–0 SYSCLKDIV
[2:0]
System clock division ratio select SYSCLKDIV[2:0] Division ratio
0x0 R/W Clock source =
OSC (OSC3, PLL,
or OSC1)
Write-protected
0x7–0x6
0x5
0x4
0x3
0x2
0x1
0x0
1/1
1/32
1/16
1/8
1/4
1/2
1/1
CMU_CLK
Select Register
(CMU_CMUCLK)
0x300106
(8 bits)
D7–5 –
reserved
–
–
–
0 when being read.
D4–0 CMU_
CLKSEL[4:0]
CMU_CLK select
CMU_CLKSEL[4:0]
CMU_CLK
0x0 R/W OSC: system clock
(OSC3, PLL, OSC1)
Write-protected
0xf–0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
OSC•1/32
OSC•1/16
OSC•1/8
OSC•1/4
OSC•1/2
OSC•1/1
LCLK
BCLK
PLL
OSC1
OSC3
PLL Input Clock
Division Ratio
Select Register
(CMU_
PLLINDIV)
0x300107
(8 bits)
D7–4 –
reserved
–
–
–
0 when being read.
D3–0 PLLINDIV
[3:0]
PLL input clock division ratio
select
PLLINDIV[3:0] Division ratio
0x7 R/W Clock source =
OSC3
Write-protected
0xf–0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
1/8
1/10
1/9
1/8
1/7
1/6
1/5
1/4
1/3
1/2
1/1