
APPENDIX A LIST OF I/O REGISTERS
S1C17705 TECHNICAL MANUAL
Seiko Epson Corporation
AP-A-15
0x5063, 0x50a0–0x50a6
LCD Driver
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
LCD Clock
Select Register
(LCD_CLK)
0x5063
(8 bits)
D7
–
reserved
–
0 when being read.
D6–4 LCKDV[2:0] LCD clock division ratio select
LCKDV[2:0]
Division ratio
0x0 R/W When the clock
source is IOSC or
OSC3
0x7–0x5
0x4
0x3
0x2
0x1
0x0
reserved
1/512
1/256
1/128
1/64
1/32
D[3:2] LCKSRC
[1:0]
LCD clock source select
LCKSRC[1:0]
Clock source
0x1 R/W
0x3
0x2
0x1
0x0
reserved
OSC3
OSC1
IOSC
D1
–
reserved
–
0 when being read.
D0
LCKEN
LCD clock enable
1 Enable
0 Disable
0
R/W
LCD Display
Control Register
(LCD_DCTL)
0x50a0
(8 bits)
D7
SEGREV
Segment output assignment control 1 Normal
0 Reverse
1
R/W
D6
COMREV
Common output assignment control 1 Normal
0 Reverse
1
R/W
D5
DSPAR
Display memory area control
1 Area 1
0 Area 0
0
R/W
D4
DSPREV
Reverse display control
1 Normal
0 Reverse
1
R/W
D3
–
reserved
–
0 when being read.
D2
COMPOS
Common pin assignment control
1 Center
0 End
0
R/W
D1–0 DSPC[1:0] LCD display control
DSPC[1:0]
Display
0x0 R/W
0x3
0x2
0x1
0x0
All off
All on
Normal display
Display off
LCD Contrast
Adjustment
Register
(LCD_CADJ)
0x50a1
(8 bits)
D7–4 –
reserved
–
0 when being read.
D3–0 LC[3:0]
LCD contrast adjustment
LC[3:0]
Display
0x7 R/W
0xf
:
0x0
Dark
:
Light
LCD Clock
Control Register
(LCD_CCTL)
0x50a2
(8 bits)
D7–4 FRMCNT[3:0] Frame frequency control
fLCLK × duty
FRMCNT[3:0] = ————— - 1
4 × fLFR
0x3 R/W
D3
–
reserved
–
0 when being read.
D2–0 LDUTY[2:0] LCD duty select
LDUTY[2:0]
Duty
0x2 R/W
0x7–0x6
0x5
0x4
0x3
0x2
0x1
0x0
reserved
1/32 (Type B)
1/32 (Type A)
1/24
1/32
1/16
reserved
LCD Voltage
Regulator
Control Register
(LCD_VREG)
0x50a3
(8 bits)
D7–5 –
reserved
–
0 when being read.
D4
LHVLD
LCD heavy load protection mode
1 On
0 Off
0
R/W
D3–0 –
reserved
–
0 when being read.
LCD Power
Voltage Booster
Control Register
(LCD_PWR)
0x50a4
(8 bits)
D7–2 –
reserved
–
0 when being read.
D1
VDSEL
Regulator power source select
1 VD2
0 VDD
0
R/W
D0
PBON
Power voltage booster control
1 On
0 Off
0
R/W
LCD Interrupt
Mask Register
(LCD_IMSK)
0x50a5
(8 bits)
D7–1 –
reserved
–
0 when being read.
D0
FRMIE
Frame signal interrupt enable
1 Enable
0 Disable
0
R/W
LCD Interrupt
Flag Register
(LCD_IFLG)
0x50a6
(8 bits)
D7–1 –
reserved
–
0 when being read.
D0
FRMIF
Frame signal interrupt flag
1 Occurred
0 Not occurred
0
R/W Reset by writing 1.
0x5066, 0x5100–0x5104
SVD Circuit
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
SVD Clock
Control Register
(SVD_CLK)
0x5066
(8 bits)
D7–4 –
reserved
–
0 when being read.
D3–2 CLKSRC
[1:0]
SVD clock source select
CLKSRC[1:0]
Clock source
0x1 R/W
0x3
0x2
0x1
0x0
reserved
OSC3/512
OSC1
IOSC/128
D1
–
reserved
–
0 when being read.
D0
CLKEN
SVD clock enable
1 Enable
0 Disable
0
R/W
SVD Enable
Register
(SVD_EN)
0x5100
(8 bits)
D7–1 –
reserved
–
0 when being read.
D0
SVDEN
SVD enable
1 Enable
0 Disable
0
R/W