HD6473847RHV Datasheet, PDF (367/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 13 LCD Controller/Driver
13.4 Operation
13.4.1 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 V2 and V3 as shown in figure 13.2.
VCC
V1
V2
V3
VSS
Figure 13.2 Handling of LCD Drive Power Supply when Using 1/2 Duty
B. Large-panel display
As the impedance of the on-chip 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 13.4.4, Boosting 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.
C. LCD drive power supply setting
With this LSI, there are two ways of providing LCD power: by using the on-chip power
supply circuit, or by using an external power supply circuit.
When an external power supply circuit is used for the LCD drive power supply, connect the
external power supply to the V1 pin.
Rev. 7.00 Mar. 08, 2010 Page 335 of 510
REJ09B0024-0700