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UPD17015 Datasheet(PDF) 67 Page - NEC |
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UPD17015 Datasheet(HTML) 67 Page - NEC |
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67 / 120 page  67 µPD17015 13. LCD CONTROLLER/DRIVER The LCD (liquid crystal display) controller/driver, in combination with the segment signal output, controls an LCD display of up to 36 segments. 13.1 Overview Fig. 13-1 shows an overview of the LCD controller/driver. The LCD controller/driver controls a display consisting of up to 36 segments by using both the common signal output (COM0 to COM3 pins) and segment signal output (LCD0 to LCD8 pins). The driving method features a 1/4 duty cycle and 1/2 bias, a frame frequency of 150 Hz, and a driving voltage of VDD - VLCD0. Fig. 13-1 Overview of LCD Controller/Driver Segment signal output timing control block Common signal output timing control block LCD driving voltage generation block LCD segment register (data memory space) Basic clock for timing control LCDEN flag LCD0 pin LCD8 pin COM0 pin COM3 pin VLCD0 pin VLCD1 pin CAP0 pin CAP1 pin Remark LCDEN (bit 3 of the LCD enable register; see Fig. 13-6) turns the entire LCD display on or off. |
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