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LCD Controller Introduction
18-3LCD Controller
Figure 18−1. LCD Controller Block Diagram
Display
Memory
20x
8−bits
Segment
Output
Control
Mux
Analog
Voltage
Multiplexer
Timing Generator
R23
R13
R03
COM0
COM2
COM1
R33
COM3
S0
S1
Common
Output
Control
S39
S38
SEG0
SEG1
SEG38
SEG39
Mux
Mux
Mux
LCDP2
LCDP1
LCDP0
LCDMX1
LCDMX0
LCDSON
LCDON
f
LCD
(from Basic Timer)
OSCOFF
(from SR)
V1
V2
V3
V4
V5
VDVCVBVA
Static 2Mux 3Mux
4Mux
R
R
RxRx Rx
R
R
R
External Resistors
091h
0A4h
Rx = Optional Contrast Control