h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 556

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 17 LCD Controller/Driver
17.4
17.4.1
To perform LCD display, the hardware and software related items described below must first be
determined.
1. Hardware Settings
Rev. 2.00 Dec. 05, 2005 Page 518 of 724
REJ09B0200-0200
A. Using 1/2 duty
B. Large-panel display
C. LCD drive power supply setting
When 1/2 duty is used, interconnect pins V2 and V3 as shown in figure 17.2.
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,
see section 17.4.4, 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.
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.
Operation
Settings up to LCD Display
Figure 17.2 Handling of LCD Drive Power Supply when Using 1/2 Duty
LPV
V
SS
CC
V1
V2
V3