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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST72411R 데이터시트(PDF) 40 Page - STMicroelectronics |
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ST72411R 데이터시트(HTML) 40 Page - STMicroelectronics |
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40 / 71 page  ST72411R 40/71 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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