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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST9 数据表(PDF) 90 Page - STMicroelectronics |
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ST9 数据表(HTML) 90 Page - STMicroelectronics |
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90 / 146 page  90/146 ST9 USER GUIDE Characters: .byte 3Fh, 0Ch, 5Bh, 5Eh, 64h, 76h, 77h, 1Ch, 7Fh, 7Eh The LCD electrodes are connected to the outputs of a serial input, parallel output shift register. The backplane is also connected to one output. This allows us to provide the A.C. drive for the electrodes, as shown in the table below: In short, the segment is On if its level is different from that of the backplane. It is Off if its level is the same as that of the backplane. Thus, to generate the drive pattern, it is only necessary to build the four bytes that correspond to the various segments, keeping the bit corresponding to the backplane at level zero. Then, using a periodic interrupt, these four words are trans- mitted serially, but complemented every other time. As an example, to display the value 375, as in the demonstration program, the following message is built: Since in this original message the backplane bit is kept at zero, all bits that are 1 correspond to an activated segment; the others remain invisible. This message is sent at intervals of about 16 ms, but it is inverted every other time, giving the succession: This succession of inverted words guarantee a zero D.C. component across the liquid crystal solution, which is absolutely necessary. Level of the back- plane Level of one of the segments State of the liquid crystal between the electrodes 00 off 0 1 on, positive voltage 1 0 on, negative voltage 11 off Symbols Hundreds Tens Units 00000000 01011110 00011100 01110110 Symbols Hundreds Tens Units 00000000 01011110 00011100 01110110 11111111 10100001 11100011 10001001 00000000 01011110 00011100 01110110 11111111 10100001 11100011 10001001 00000000 01011110 00011100 01110110 11111111 10100001 11100011 10001001 etc. |
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