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23
LCD Driver (LCD)
23.1
lCD Module Overview
The S1C17624/622 and S1C17604/602/621 include a dot-matrix LCD driver capable of driving an LCD panel with
up to 416 segments (52 segments × 8 commons) and 288 segments (36 segments × 8 commons), respectively.
The main features of the LCD driver are listed below.
• Number of SEG and COM outputs
• Drive bias
• Display data RAM
• Frame frequency configuration
• LCD display mode
• COM and SEG pins
• LCD contrast adjustment
• Other functions
Figure 23.1.1 shows the LCD driver and drive power supply configuration.
LCKDV[2:0]
LCKSRC
Divider
HSCLK
(1/32–1/512)
OSC1
VCSEL
LCD system
voltage regulator
Power supply circuit
23.2
lCD Power Supply
The LCD drive voltages V
is needed. For more information on the LCD power supply, see the "Power Supply" chapter.
S1C17624/604/622/602/621 TeChniCal Manual
S1C17624/622: 52 SEG × 8 COM or 56 SEG × 4/3/2/1 COM
S1C17604/602/621: 36 SEG × 8 COM or 40 SEG × 4/3/2/1 COM
1/3 bias (fixed)
S1C17624/622: 56 bytes
S1C17604/602/621: 40 bytes
Adjustable with a four-bit counter
Normal display mode
All on mode
All off mode
Inverted display mode
Supports inverting memory bit assignment to the COM and SEG pins.
Selectable from among 16 values
LFRO signal output, frame interrupt
To ITC
LCKEN
LCLK
Gate
LHVLD
V
–V
C1
C3
Figure 23.
1.1 LCD Driver and Driver Power Supply Configuration
to V
are generated by the on-chip LCD voltage regulator. No external power supply
C1
C3
Seiko epson Corporation
Frame interrupt request
Interrupt
control circuit
Clock
control circuit
DSPAR
Display memory
Driver
LCD contrast
control circuit
adjustment
circuit
LC[3:0]
23 lCD DRiVeR (lCD)
LCD driver
FRMIE
LFRO
LDUTY[2:0]
FRMCNT[1:0]
COMx
SEGx
DSPREV
SEGREV
COMREV
DSPC[1:0]
23-1
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