Datasheet

Table Of Contents
Section 21 LCD Controller/Driver
Rev. 2.00 Jul. 04, 2007 Page 466 of 692
REJ09B0309-0200
21.4 Operation
21.4.1 Settings up to LCD Display
To perform LCD display, the hardware and software related items described below must first be
determined.
(1) Hardware Settings
(a) Using 1/2 duty
When 1/2 duty is used, interconnect pins V2 and V3 as shown in figure 21.2.
V1
V2
V3
V
CC
V
SS
Figure 21.2 Handling of LCD Drive Power Supply when Using 1/2 Duty
(b) Large-Panel Display
As the impedance of the on-chip power supply split-resistor is large, it may not be suitable for
driving a panel which requires a current more than the current value calculated by the on-chip
power supply split-resistor and voltage of the LCD power supply. If the display lacks sharpness
when using a large panel, refer to section 21.4.5, Boosting LCD Drive Power Supply and Fine
Adjustment. When static or 1/2 duty is selected, the common output drive capability can be
increased. Set CMX to 1 when selecting the duty cycle. In this mode, with a static duty cycle pins
COM4 to COM1 output the same waveform, and with 1/2 duty the COM1 waveform is output
from pins COM2 and COM1, and the COM2 waveform is output from pins COM4 and COM3.