HD64F38024HV Datasheet, PDF (444/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

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 V₂ and V₃ as shown in figure 13.2.
V_CC
V₁
V₂
V₃
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 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.
Rev. 8.00 Mar. 09, 2010 Page 422 of 658
REJ09B0042-0800