3822_03 Datasheet, PDF (230/328 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.7 LCD drive control circuit
2.7 LCD drive control circuit
The 3822 group includes a controller/drivers of Liquid Crystal Display (LCD). This section describes an
explanation of LCD control circuit operations, pins, related registers, usage and application examples.
2.7.1 Explanation of operations
(1) LCD drive waveform example
Refer to “CHAPTER 1 Hardware, LCD drive control circuit.”
(2) LCD drive timing
The frequency of the internal signal LCDCK and the frame frequency to generate LCD drive timing are
as follows.
f (LCDCK) = ^{Count source frequency for LCDCK}
Division ratio of LCD circuit divider
Frame frequency =
f (LCDCK)
Duty ratio number
2–164
3822 GROUP USER’S MANUAL