Lcd Driver (Lcd8B); Overview - Epson S1C17W18 Technical Manual

18 LCD Driver (LCD8B)

18.1 Overview

LCD8B is an LCD driver to drive an LCD panel. The features of the LCD8B are listed below.
• The frame frequency is configurable into 16 steps.
• Provides all on, all off, and inverse display functions as well as normal display.
• The segment and common pin assignments can be inverted.
• Provides a partial common output drive function.
• Provides an n-segment-line inverse AC drive function.
• The LCD contrast is adjustable into 32 steps.
• Includes a power supply for 1/3 bias and 1/4 bias driving (allows external voltages to be applied).
• Can generate interrupts every frame.
Figure 18.1.1 shows the LCD8B configuration.
Item
Number of segments
supported
SEG/COM outputs
Drive bias
Embedded display data RAM
LCD8B
Interrupt
controller
Clock generator
S1C17W18 TECHNICAL MANUAL
(Rev. 1.2)
Table 18.1.1 LCD8B Configuration of S1C17W18
64-pin package
Max. 96 segments
(24 segments × 4 commons)
Max. 160 segments
(20 segments × 8 commons)
24SEG × 1–4COM
20SEG × 5–8COM
Interrupt control
circuit
FRMIE
LDUTY[2:0]
FRMCNT[3:0]
BSTC[1:0]
NLINE[2:0]
Clock
CLK_LCD8B
control circuit
CLKSRC[1:0]
CLKDIV[2:0]
DBRUN
MODEN
DSPAR Display data RAM
LCD power supply
circuit
EXVCSEL
LCD voltage
LC[4:0]
booster
BSTEN
BISEL
HVLD
VCSEL
VCEN
LCD voltage
regulator
Figure 18.1.1 LCD8B Configuration
Seiko Epson Corporation
80-pin package
Max. 128 segments
(32 segments × 4 commons)
Max. 224 segments
(28 segments × 8 commons)
32SEG × 1–4COM
28SEG × 5–8COM
1/3 bias, 1/4 bias
96 bytes
FRMIF
Drive
control circuit
V
C4
V
SS
V
C4
V
SS
V
SS
V
C4
V
SS
18 LCD DRIVER (LCD8B)
128-pin package/chip
Max. 192 segments
(48 segments × 4 commons)
Max. 352 segments
(44 segments × 8 commons)
48SEG × 1–4COM
44SEG × 5–8COM
LFRO
COMx
V
SS
SEGx
V
SS
LCDDIS
DSPREV
SEGREV
COMREV
DSPC[1:0]
COMxDEN
C
P4
V
C4
C
P3
V
SS
C
P2
V
C4
C
P1
V
SS
V
C4
V
C4
V
C3
V
SS
V
C2
V
C4
V
C1
V
SS
18-1