Operation; Settings Up To Lcd Display - Renesas H8 Series Hardware Manual

Section 13 LCD Controller/Driver
13.3

Operation

13.3.1

Settings up to LCD Display

To perform LCD display, the hardware and software related items described below must first be
determined.
Hardware Settings
a. Using 1/2 duty
When 1/2 duty is used, interconnect pins V
Figure 13.2 Handling of LCD Drive Power Supply when Using 1/2 Duty
b. Large-panel display
As the impedance of the built-in power supply split-resistance is large, it may not be suitable
for driving a large panel. If the display lacks sharpness when using a large panel, refer to
section 13.3.4, Boosting the LCD Drive Power Supply. 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 COM
and with 1/2 duty the COM
waveform is output from pins COM
Rev. 7.00 Mar 10, 2005 page 426 of 652
REJ09B0042-0700
and V
2
V
CC
V
SS
waveform is output from pins COM
1
and COM .
4 3
as shown in figure 13.2.
3
V
1
V
2
V
3
to COM output the same waveform,
4 1
and COM
2
, and the COM
1 2