HD66773R Datasheet, PDF (47/133 Pages) Renesas Technology Corp – 262,144-color, 132 x 176-dot Graphics Controller Driver for TFT LCD panels

HD66773R
Write Data to GRAM (R22h)
R/W RS
W1
RAM write data (WD17-0) The pin assignment for DB17-0 varies for each interface (see below).
PD17 PD16 PD15 PD14 PD13 PD12 PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0
When RGB-I/F ^{WD WD WD WD WD WD WD WD WD WD WD WD WD WD} WD ^{WD WD WD}
17 16 _{15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0}
WD17–0: All data are expanded into 18 bits internally before being written to GRAM. Each interface has
its own way of expanding data to 18 bits.
The grayscale level is selected according to GRAM data. The address is automatically updated according
to the setting with the AM and I/D bits after data are written to GRAM. During the standby mode, no
access is allowed to GRAM. When the 9 or 18 bit interface mode is selected, set DIT = “1” to activate the
internal hardware-dither circuit before writing to GRAM.
18-bit interface ^{262,144 colors available}
Input pin DB DB DB DB DB DB DB DB DB DB DB DB DB DB DB DB DB DB
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Dither process
circuit
HD HD HD HD HD HD HD HD HD HD HD HD HD HD HD HD HD HD
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Shrinking
Shrinking
GRAM write data
WD WD WD WD WD WD WD WD WD WD WD WD WD WD WD WD
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RGB assignment R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 _{B4 B3 B2 B1 B0}
1 pixel
Note: Write data into GAM after setting DIT = “1”.
Rev.1.10, Jun.21.2003, page 47 of 133