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22 LCD Driver (LCD)
22.1 Configuration of LCD Driver
The S1C17704 is equipped with an LCD driver which can drive an LCD panel with a maximum of 1,792 pixels (56
segments × 32 commons).
Figure 22.1.1 shows the configuration of the LCD driver and the drive power supply.
Divider
OSC3
(1/32–1/512)
OSC1
V
DD
Power voltage
booster
V
D2
PBON
VDSEL
Power supply circuit
Figure 22.1.1 Configuration of LCD Driver and Drive Power Supply
S1C17704 TECHNICAL MANUAL
LCD driver
To ITC
Frame interrupt request
OSC
LCLK
Gate
LHVLD
Display memory
LCD system
V
–V
C1
C5
voltage
regulator
EPSON
Interrupt
control circuit
Clock
control circuit
DSPAR
Driver
LCD
contrast
control circuit
adjustment
circuit
LC[3:0]
22 LCD DRIVER (LCD)
FRMIE
LDUTY[1:0]
COM0–COM31
SEG0–SEG55
DSPREV
SEGREV
COMREV
DSPC[1:0]
22-1
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