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ST72411R データシート(PDF) 40 Page - STMicroelectronics

部品番号 ST72411R
部品情報  8-BIT MCU WITH SMARTCARD INTERFACE, LCD DRIVER, 8-BIT TIMER, SAFE RESET AND SUPPLY MONITORING
PDF  71 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72411R データシート(HTML) 40 Page - STMicroelectronics

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5.4 32 x 4 LCD DRIVER
5.4.1 Introduction
The LCD driver controls up to 32 segments and 4
backplanes for driving up to 32x4 (128) LCD seg-
ments.
The LCD input clock can be divided by a selected
ratio depending on the required frame frequency.
The parameters to display are stored in a 16-bytes
LCD dual port RAM.
The peripheral can be switched off by software to
reduce power consumption when not in use.
No external capacitor/resistor network is required
as it is integrated on the chip.
Figure 31. LCD Driver Block Diagram
fosc/2
fLCD
COM2
LCD RAM
32x4 bits
COM
MUX 128 to 32
fLCD
COM[3:0]
DRIVERS
COM3
COM1
COM0
...
SEG
DRIVERS
SEG31
SEG0
fLCD
COM[3:0]
Address Bus
Data Bus
VDD
VSS
SEG[31:0]
FREQUENCY
SELECTION
RING
COUNTER
REFERENCE VOLTAGE
GENERATOR
To COM and SEG Drivers
4
Vss
2VDD/3
VDD
VDD/3
32



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