Renesas H8/38024 Series, Hardware Manual

Page: 444 / 661

Rev. 6.00, 08/04, page 414 of 628
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
2
and V
3
as shown in figure 13.2.
V
CC
V
1
V
2
V
3
V
SS
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
4
to COM
1
output the same waveform,
and with 1/2 duty the COM
1
waveform is output from pins COM
2
and COM
1
, and the COM
2
waveform is output from pins COM
4
and COM
3
.