HD66781 Datasheet, PDF (89/196 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
RAM Write Data Mask 1/2 (R203h/R204h)
R/W RS IB15 IB14 IB13 IB12 IB11 IB10 IB9 IB8 IB7 IB6 IB5 IB4 IB3 IB2 IB1 IB0
W1
0
0
WM WM WM WM WM WM
[11] [10] [9] [8] [7] [6]
0
0
WM WM WM WM WM WM
[5] [4] [3] [2] [1] [0]
W1 0 0
0
0
0
0
0
0
0
0
WM WM WM WM WM WM
[17] [16] [15] [14] [13] [12]
Note 1) Top R203, bottom R204
WM[17:0]: Write-mask data by bit when the data are written to GRAM. For example, if WM17 = 1, the
WM17 write-mask the MSB of the data to write to GRAM so that the data in the MSB is not written to
GRAM. The rest of WM16 ~ 0 bits also write-mask the data in the corresponding bits of GRAM write data
as well when they are set to 1.
The WM17-0 bits write-mask the 18-bit data to write to GRAM.
Note 1) This function is not available in the RGB-I/F mode.
Note 2) OSD image data are written to RAM in the ODF = 0 format. The write-mask setting for OSD images must be
made for the ODF = 0 format.
Write mask
WM
[17]
WM
[16]
WM
[15]
WM
[14]
WM
[13]
WM
[12]
WM
[11]
WM
[10]
WM
[9]
WM
[8]
WM
[7]
WM
[6]
WM
[5]
WM
[4]
WM
[3]
WM
[2]
WM
[1]
WM
[0]
GRAM
Write data
OSD data
R5 R4 R3 R2 R1 R0 G5 G4 G3 G2 G1 G0 B5 B4 B3 B2 B1 B0
R5 R4 R3 R2 R1 α 2 G5 G4 G3 G2 G1 α1 B5 B4 B3 B2 B1 α 0
RAM write data mask
Rev.0.5, July.31.2003, page 89 of 196