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ML9058E Datasheet(PDF) 26 Page - LAPIS Semiconductor Co., Ltd. |
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ML9058E Datasheet(HTML) 26 Page - LAPIS Semiconductor Co., Ltd. |
26 / 76 page FEDL9058E-01 LAPIS Semiconductor ML9058E 26/76 Display Timing Generator Circuit This circuit generates the timing signals for the line address circuit and the display data latch circuit from the display clock. The display data is latched in the display data latch circuit and is output to the segment drive output pins in synchronization with the display clock. This circuit generates the timing signals for the line address circuit and the display data latch circuit from the display clock. The display data is latched in the display data latch circuit and is output to the segment drive output pins in synchronization with the display clock. The read out of the display data to the LCD drive circuits is completely independent of the display data RAM access from the MPU. As a result, there is no bad influence such as flickering on the display even when the display data RAM is accessed asynchronously during the LCD display. Also, the internal common timing and LCD frame reversal (FR) signals are generated by this circuit from the display clock. The drive waveforms of the frame reversal drive method shown in Fig. 5(a) for the LCD drive circuits are generated by this circuit. The drive waveforms of the line reversal drive method shown in Fig. 5(b) are also generated by the command. RAM DATA VSS V5 COM1 48 49 1 2 3 4 5 6 V2 V1 VSS V4 SEGn V3 V1 44 45 46 47 48 49 1 23 4 5 6 VSS V5 COM0 V2 V1 FR LCDCK (display clock) Fig. 5(a) Waveforms in the frame reversal drive method |
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