SH7721 datasheet(977/1524 Pages) RENESAS

977 / 1524 page

Section 26

LCD Controller (LCDC)

Rev. 3.00 Jan. 18, 2008 Page 915 of 1458

REJ09B0033-0300

(TFT module)

State

Power Supply for

Logic

Display Data,

Timing Signal

Power Supply for

High-Voltage Systems

Control Pin

LCD_VCPWC

LCD_CL2, LCD_CL1,

LCD_FLM,

LCD_M_DISP,

LCD_DATA

LCD_VEPWC

Operating State

Supply

(Transitional State)

Supply

Stopped State

The table above shows the states of the power supply, display data, and timing signals for the

typical LCD module in its active and stopped states. Some of the supply voltages described may

not be necessary, because some modules internally generate the power supply required for high-

voltage systems from the logic-level power-supply voltage.

Notes on display-off mode (LCDC stopped):

If LCD module power-supply control-sequence processing is in use by the LCDC or the supply of

power is cut off while the LCDC is in its display-on mode, normal operation is not guaranteed. In

the worst case, the connected LCD module may be damaged.

26.4.7

Operation for Hardware Rotation

Operation in hardware-rotation mode is described below. Hardware-rotation mode can be thought

of as using a landscape-format LCD panel instead of a portrait-format LCD panel by placing the

landscape-format LCD panel as if it were a portrait-format panel. Whether the panel is intended

for use in landscape or portrait format is thus no problem. The panel must, however, be within 320

pixels wide.

When making settings for hardware rotation, the following five differences from the setting for no

hardware rotation must be noted. (The following example is for a display at 8 bpp. At 16 bpp, the

amount of memory per dot will be doubled. The image size and register values used for rotation

will thus be different.)

1. The image data must be prepared for display in the rotated panel. (If 240

× 320 pixels will be

required after rotation, 240

× 320 pixel image data must be prepared.)

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