Lcd Driver (Lcd8D); Overview - Epson S1C31W65 Technical Manual

21 LCD Driver (LCD8D)

21.1 Overview

LCD8D is an LCD driver to drive an LCD panel. The features of the LCD8D are listed below.
• The frame frequency is configurable into 16 steps.
• Two types of LCD drive waveforms (Waveform A and Waveform B) can be generated.
• 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.
• Includes a power supply for 1/2 or 1/3 bias driving (allows external voltages to be applied).
• Provides the frame signal monitoring output pin.
• Can generate interrupts every frame.
Figure 21.1.1 shows the LCD8D configuration.
Item
Number of segments supported
SEG/COM outputs
LCD drive voltage mode
Drive bias
LCD contrast
Embedded display data RAM
LCD8D
CPU
LDUTY[2:0]
FRMCNT[3:0]
LCDWAVE
NLINE[2:0]
CLK_LCD8D
CLKSRC[1:0]
Clock generator
CLKDIV[2:0]
RESISEL[1:0]
S1C31W65 TECHNICAL MANUAL
(Rev. 1.1)
(Note: See the table below.)
Table 21.1.1 LCD8D Configuration of S1C31W65
Max. 224 segments (56SEG × 4COM), Max. 416 segments (52SEG × 8COM)
Internal generation mode and external voltage application mode 1, 2, 3
Adjustable into 32 steps (LCD drive voltage internal generation mode only)
Interrupt control
circuit
FRMIE
BSTC[1:0]
Clock
control circuit
DBRUN
MODEN
Display data
DSPAR
RAM
LCD power
supply circuit
EXVCSEL
LCD voltage
LC[4:0]
booster
BSTEN
BIASSEL
HVLD
LCD voltage
VCSEL
regulator
VCEN
Figure 21.1.1 LCD8D Configuration
Seiko Epson Corporation
S1C31W65
56SEG × 1–4COM, 52SEG × 5–8COM
1/2 or 1/3 bias
112 bytes
FRMIF
Drive
control circuit
21 LCD DRIVER (LCD8D)
LFRO
COMx
V
SS
SEGx
V
SS
LCDDIS
DSPREV
SEGREV
COMREV
DSPC[1:0]
COMxDEN
V
C3
C
P2
V
C3
V
SS
C
P1
V
SS
V
C3
V
C3
V
SS
V
C2
V
C3
V
SS
V
C1
V
SS
21-1