hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 468

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 LCD Controller/Driver
13.3
13.3.1
To perform LCD display, the hardware and software related items described below must first be
determined.
Hardware Settings
a. Using 1/2 duty
b. Large-panel display
Rev. 7.00 Mar 10, 2005 page 426 of 652
REJ09B0042-0700
When 1/2 duty is used, interconnect pins V
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
Settings up to LCD Display
Operation
Figure 13.2 Handling of LCD Drive Power Supply when Using 1/2 Duty
1
waveform is output from pins COM
4
and COM
V
V
2
CC
SS
and V
3
.
3
as shown in figure 13.2.
V
V
V
1
2
3
4
to COM
1
2
output the same waveform,
and COM
1
, and the COM
2