hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 88

• Manufacturer Part Number: hd66789
• Description: 528-channel, One-chip Driver For Amorphous Tft Panels With 262,144-color Display Ram, Power Supply Circuit, And Gate Circuit
• Manufacturer: Renesas Electronics Corporation.

HD66789
External Display Interface
The following interfaces are available as the external display interface (RGB interface). The interface is
selected by setting RIM1-0 bits. RAM is accessible through the RGB interface.
RIM bits setting and RGB interface
RIM1
0
0
1
1
Note 1) The use of multiple interfaces simultaneously is not possible.
RGB interface
Through the RGB-I/F, the display operation is performed in synchronization with VSYNC, HSYNC, and
DOTCLK. The RGB interface enables data transmission with low power consumption by overwriting the
area that needs update in high-speed write mode in combination with the window address function. The
front and back porches must be set before and after the display period.
Rev.0.12, May 09 2003, page 88 of 156
RIM0
0
1
0
1
Note 3) In RGB interface mode, VSYNC, HSYNC, and DOTCLK more than to achieve the LCD resolution must be supplied.
RGB Interface
18-bit RGB interface
16-bit RGB interface
6-bit RGB interface
Setting disabled
VSYNC: Frame synchronization signal
HSYNC: Raster-row synchronization signal
DOTCLK: Dot clock
ENABLE: Data enable signal
VLD: Data valid signal
PD17-0: Display data for RGB (6:6:6)
VSYNC
DOTCLK
ENABLE
HSYNC
PD17-0
VLD
Display area for RAM data
Display area
for moving pictures
Back porch period (BPP):14H>=BP3-0>=2H
Front porch period (FPP):14H>=FP3-0>=2H
Display operation period: NL4-0 =< 240H
The number of raster-rows of 1 frame: FPP + DP + BPP
RGB interface
FPP + BPP =< 16H
Note 1) The front porch period continues until the next input
Note 2) The DOTCLK signal must be supplied consecutively.
PD Pin
PD17-0
PD17-13, 11-1
PD17-12
Back porch period (BP3-0)
Display period (NL4-0)
Front porch period (FP3-0)
of VSYNC signal.
Preliminary