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AN3114 Datasheet(PDF) 18 Page - STMicroelectronics

Part # AN3114
Description  This application note describes techniques for connecting
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3114 Datasheet(HTML) 18 Page - STMicroelectronics

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Integrated LCD controller
AN3114
18/43
Doc ID 16829 Rev 3
3
Integrated LCD controller
3.1
Benefits of integrated LCD controllers
The medium density STM8AL3Lxx devices, medium density STM8L152xx devices,
medium+ density STM8L152xx devices, and high density STM8L152xx/STM8L162xx
integrate an LCD control module that offers various advantages, including its overall design
optimized to achieve an immediate reduction in component count and board space saving,
and thus reducing the total system cost and power consumption.
The LCD controller is composed of three main blocks (see Figure 10: Medium density LCD
controller block diagram and Figure 11: Medium+ and high density LCD controller block
diagram):
●
The frequency generator
●
The common/segments driver
●
The contrast controller
Figure 10.
Medium density LCD controller block diagram
LCDCLK
LCD RAM
(14x8 bits)
COM0
COM3
SEG27
SEG0
VLCD
VSS
SEG[27:0]
COM[3:0]
PS[3:0]
DIV[3:0]
LCDCLK/65536
LCDCLK
ck_div
CLOCK MUX
Divide by 16 to 31
EN
HD
Analog
switch
array
CONTRAST
CONTROLLER
LCD REGS
VOLTAGE
GENERATOR
CC[2:0]
1/3 VLCD
2/3 VLCD
1/2 VLCD
COM
DRIVER
SEG
DRIVER
B2
Interrupt
PULSE GEN
ck_ps
I/O Ports
Analog booste r
READY
VSEL
STATIC
28
16-bit Prescaler
LCD REGS
FREQUENCY GENERATOR
FREQUENCY GENERATOR
FREQUENCY GENERATOR
COMMON/SEGMENT DRIVER
COMMON/SEGMENT DRIVER
CONTRAST CONTROLLER
CONTRAST CONTROLLER



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