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HD66789 Datasheet(PDF) 91 Page - Renesas Technology Corp |
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HD66789 Datasheet(HTML) 91 Page - Renesas Technology Corp |
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91 / 156 page  HD66789 Preliminary Rev.0.12, May 09 2003, page 91 of 156 Moving picture display The HD66789 incorporates the RGB interface to display moving pictures and RAM to store display data, which provides the following merits in displaying moving pictures. • The window address function enables the transfer of only data for the moving picture area. • The high-speed write mode enables high-speed access to RAM with low power consumption • Only transmitting data that are written over the moving picture area. • Reduced transmission contributes to the reduction of power consumption of the entire system. • In combination with a system interface, the still picture area, such as an icon, can be updated while displaying moving pictures. RAM access through system interface in RGB-I/F mode RAM is accessible through a system interface in the RGB-I/F mode. In the RGB interface mode, data are being written to RAM in synchronization with the DOTCLK input while the ENABLE is “Low”. When writing data to RAM through the system interface, it is necessary to set ENABLE to “High” to stop data write through the RGB-I/F. Setting RM = 0 allows RAM access through the system interface. When reverting to the RGB interface mode, wait a write/read bus cycle. Then, set RM = 1 and the index to R22h to start RAM access though the RGB-I/F. When the RAM writes through the RGB and system interface conflicts, it is not guaranteed that the data are properly written to RAM. The following is an example of moving picture display through the RGB-I/F and updating still picture area through the system interface. Moving picture area 2001/01/01 00:00 Still picture area VSYNC ENABLE DOTCLK PD17-0 Updating moving picture area Updating moving picture area Updating of still picture area * Note 1 Index set System interface Updating screen Updating screen Index R22 RM=0 Setting of address Index R22 Updating of area other than moving picture area RM=1 Setting of address Index R22 *Note 2 Note 1) In the RGB interface mode, the address is set at every falling edge of VSYNC. Note 2) Set the address and the index (R22h) before RAM access starts through the RGB interface mode. Note 3) In the RGB interface mode write data in the high-speed write mode (HWM = 1). Updating Still Picture Area during Displaying Moving Picture |
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