SH7721 datasheet(978/1524 Pages) RENESAS

978 / 1524 page

Section 26

LCD Controller (LCDC)

Rev. 3.00 Jan. 18, 2008 Page 916 of 1458

REJ09B0033-0300

2. The register settings for the address of the image data must be changed (LDSARU and

LDLAOR).

3. LDLAOR should be power of 2 (when the horizontal width after rotation is 240 pixels,

LDLAOR should be set to 256).

4. Graphics software should be set up for the number 3 setting.

5. LDSARU should be changed to represent the address of the data for the lower-left pixel of the

image rather than of the data for the upper-left pixel of the image.

Picture image

LDSARU (start point)

LDSARU + LDLAOR

− 1

Scanning starts from LDSARU.

Scanning is done from small address

to large address of X coordination.

LDSARU + LDLAOR

× LDVDLNR − 1(end point)

Picture image

LCD panel

Start point

End point

1) Normal mode

Figure 26.8

Operation for Hardware Rotation (Normal Mode)

For example, the registers have been set up for the display of image data in landscape format (320

× 240), which starts from LDSARU = 0x0c001000, on a 320 × 240 LCD panel. The graphics

driver software is complete. Some changes are required to apply hardware rotation and use the

panel as a 240

× 320 display. If LDLAOR is 512, the graphics driver software uses this power of 2

as the offset for the calculation of the addresses of Y coordinates in the image data. Before setting

ROT to 1, the image data must be redrawn to suit the 240

× 320 LCD panel. LDLAOR will then

be 256 because the size has changed and the graphics driver software must be altered accordingly.

SH7721 Datasheet(PDF) 978 Page - Renesas Technology Corp