GMS81C5108
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.
SEG0
Display Memory
(37Nibbles)
WTMR[1:0]
00
01
f
SUB
7
f
MAIN÷2
10
f
MAIN
M U X
÷ 32
÷ 64
clock
MUX
÷ 128
÷ 256
SEG33
SEG34/COM3
SEG35/COM2
Select clock
LCD
LCDEN
SEG36/COM1
Control Register
Select Duty
COM0
LCR[0F1H]
Figure 19-1 LCD Driver Block Diagram
JUNE 2001 Ver 1.0
71
HYNIX [ HYNIX SEMICONDUCTOR ]
