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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.
1. Hardware settings
a. Using 1/2 duty
When 1/2 duty is used, interconnect pins V
Figure 13.3 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 13.3.6, 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
the same waveform, and with 1/2 duty the COM
COM
, and the COM
1
c. Luminance adjustment function (V
Connecting a resistance between the V
For details, see 13.3.3, Luminance Adjustment Function (V
d. LCD drive power supply setting
With the H8/3827R Series, there are two ways of providing LCD power: by using the on-
chip power supply circuit, or by using an external circuit.
When the on-chip power supply circuit is used for the LCD drive power supply, the V
V
pins should be interconnected externally, as shown in figure 13.4 (a).
1
V
CC
V
SS
waveform is output from pins COM
2
pin)
0
and V
0
and V
as shown in figure 13.3.
2
3
V
0
V
1
V
2
V
3
waveform is output from pins COM
1
and COM
4
pins enables the luminance to be adjusted.
1
Pin).
0
to COM
output
4
1
and
2
.
3
and
0
333
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