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LCD chipset HD44780A00

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hbaocr

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hd44780a00

hello everyone, :D merry Xmas!:D
I have some question about LCD HD44780 of hitachi !
which is difference between V1-V2..V5(pin 26->30) and VCC pin (in datasheet below they say that they are also power supply)! and
which is the usage of COM1->COM16 pin!
 

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