HD66781 Datasheet, PDF (87/196 Pages) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

HD66781
Preliminary
Read Data from GRAM (R202h)
R/W RS
R1
RAM read data (RD[17:0]) are assigned differently to the DB[17:0] pins according to an interface .
RD[17:0]: Read 18-bit data from GRAM. The RAM read data (RD[17:0]) are assigned differently to the
DB[17:0] pins according to an interface.
When data are read out from GRAM to the microcomputer, the first-word data read immediately after the
GRAM address set are latched in the internal read-data latch, and the data in the data bus (DB17–0) are
nullified. The data are read as valid data from the second word.
When the 8-/16-bit interfaces are selected, the GRAM data in the LSBs of R and B pixels are not read out.
When reading out OSD data, it takes the data format when ODF = 0. This function is not available in the
RGB interface mode. Set TRI = 0 while data read is executed.
18-bit interface
GRAM
data
R5 R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B5 B4 B3 B2 B1 B0
read data
RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD
[17] [16] [15] [14] [13] [12] [11] [10] [9] [8] [7] [6] [5] [4] [3] [2] [1] [0]
output 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
16-bit interface
GRAM
data
R5 R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B5 B4 B3 B2 B1 B0
read data
RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD
[17] [16] [15] [14] [13] [12] [11] [10] [9] [8] [7] [6] [5] [4] [3] [2] [1]
RD
[0]
output pin
DB DB DB DB DB DB DB DB
17 16 15 14 13 12 11 10
DB DB DB DB DB DB DB DB
8
7
6
5
4
3
2
1
Read data from GRAM: 18/16-bit interface
Rev.0.5, July.31.2003, page 87 of 196