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21 LCD DRIVER (LCD8D)
21.2 Output Pins and External Connections
21.2.1 List of Output Pins
Table 21.2.1.1 lists the LCD8D pins.
Pin name
I/O
*1
COM0–3
A
COM4–7/SEG0–3
A
SEG4–55
A
LFRO
O
V
P
C1
V
P
C2
V
P
C3
C
A
P1
C
A
P2
*1: Indicates the status when the pin is configured for LCD8D.
If the port is shared with the LCD8D pin and other functions, the LCD8D output function must be assigned to the
port before activating the LCD8D. For more information, refer to the "I/O Ports" chapter.
The COM/SEG combination pin function is switched between the COM pin and the SEG pin according to the
COM pin assignment and drive duty selected via software. For the pin configuration, refer to "Drive Duty Switch-
ing."
Notes: • Be sure to avoid using the V
• When an LCD panel is connected, set the LCD8DCTL.LCDDIS bit to 1, as activating the LCD
panel when it is set to 0 may cause the LCD panel characteristics to fluctuate.
21.2.2 External Connections
Figure 21.2.2.1 shows a connection diagram between LCD8D and an LCD panel.
Note: When the panel is connected, the LCD8DCTL.LCDDIS bit must be set to 1 to bias the panel
even if display is turned off.
Figure 21.2.2.1 Connections between LCD8D and an LCD Panel
21-2
Table 21.2.1.1 List of LCD8D Pins
Initial status
*1
Hi-Z / O (V
)
Common data output pins
SS
*2
Hi-Z / O (V
)
Common data output/segment data output combination pins
SS
*2
Hi-Z / O (V
)
Segment data output pins (See Table 21.2.1.2.)
SS
*2
O (L)
Frame signal monitoring output pin
–
LCD panel drive power supply pin
–
LCD panel drive power supply pin
–
LCD panel drive power supply pin
–
LCD voltage booster capacitor connecting pin
–
LCD voltage booster capacitor connecting pin
to V
C1
C3
COMm
COM0
SEGn
SEG0
S7C17 LCD8D
Seiko Epson Corporation
Function
*2: When LCD8DCTL.LCDDIS bit = 1
pin outputs for driving external circuits.
LCD Panel
S1C31W65 TECHNICAL MANUAL
(Rev. 1.1)
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