hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 63

• 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
RAM Write Data Mask (R23h)
RAM Write Data Mask (R24h)
WM17–0: Write-mask the data when they are written to GRAM by bit. 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 are not written to
GRAM. The rest of WM16-0 bits also write-mask the data in the corresponding bits when these bits are set
to “1”. For details, see the “Graphics Operation Function” section.
The WM17-0 bits write-mask the data to write to GRAM, which are expanded, if necessary, into 18 bits.
This function is not available in the RGB-I/F mode.
Rev.0.12, May 09 2003, page 63 of 156
R/W
W
W
RS
1
1
Write data to
Write mask
IB15 IB14 IB13 IB12 IB11 IB10 IB9
0
0
GRAM
0
0
WM
R5
17
WM
11
WM
R4
16
0
WM
WM
R3 R2
15
10
0
WM
14
WM
9
WM
0
R1
13
RAM write data mask
WM
WM
R0
12
8
1
WM
G5
11
WM
7
1
WM
G4
10
IB8
WM
WM
One pixel
G3
9
6
1
WM
G2
8
IB7
0
0
WM
G1 G0
7
IB6
WM
0
1
6
WM
B5
WM
IB5
WM
5
17
5
WM
B4
4
WM
WM
IB4
16
4
WM
B3
3
WM
WM
IB3
B2
WM
2
15
3
WM
B1
1
WM
IB2
WM
14
Preliminary
2
WM
B0
0
WM
IB1
WM
13
1
WM
IB0
WM
12
0