GMS81C5108
JUNE 2001 Ver 1.0
71
19. LCD DRIVER
The GMS81C5108 has the circuit that directly drives the
liquid crystal display (LCD) and its control circuit. The
Segment/Common Driver directly drives the LCD panel,
and the LCD Controller generates the segment/common
signals according to the RAM which stores display data. In
addition, VCL2 ~ VCL0 pin are provided as the drive pow-
er pins.
The GMS81C5108 has the following pins connected with
LCD.
1.
Segment output port 37 pins (SEG0-SEG36)
2.Common output port 4 pins (COM0-COM3)
19.1 Configuration of LCD driver
Figure 19-1 shows the configuration of the LCD driver.
Figure 19-1 LCD Driver Block Diagram
COM0
SEG34/COM3
SEG35/COM2
SEG36/COM1
SEG0
Di
spl
a
y
Data S
e
le
ct
Control
Di
sp
la
y Da
ta
Bu
ffe
r
re
g
is
te
r
LCD
Display Memory
S
egm
ent
/C
om
m
on Driver
(37Nibbles)
÷
32
÷
64
÷
128
÷
256
Ti
mi
ng Cont
ro
l
SEG33
Select clock
clock
LCR[0F1H]
LCD
LCDEN
INT
E
RNAL
BUS
L
INE
MUX
WTMR[1:0]
M U X
f
SUB
f
MAIN
00
10
Prescal
e
r
f
MAIN
÷÷÷÷
2
7
01
Select Duty
Control Register
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