hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 54

• 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
GRAM Address Range
AD15–AD0
“0000”H – “00AF”H
“0100”H – “01AF”H
“0200”H – “02AF”H
“0300”H – “03AF”H
“EC00”H – “ECAF”H
“ED00”H – “EDAF”H
“EE00”H – “EEAF”H
“EF00”H – “EFAF”H
Write Data to GRAM (R22h)
WD17–0: All data are expanded into 18 bits internally before 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 8 or 16 bit interface modes is selected, the data in the MSB of R and B
pixels are also written to the LSB of R and B pixels respectively to expand the 8/16- bit data into the 18bit
data internally.
During the RGB interface mode, when writing data to RAM through a system interface, make sure to avoid
conflicts between writing through the RGB interface and writing through the system interface.
When the 18-bit RGB interface is selected, the18-bit data in PD17-0 bits are written, and 262,144 colors are
available. When the 16-bit RGB interface is selected, the data in the MSB of R and B pixels are also
written to the LSB of R and B pixels respectively, and 65,536 colors are available.
Rev.0.12, May 09 2003, page 54 of 156
RGB-I/F
mode:
R/W
W
RS
1
:
PD17 PD16
WD
17
WD
16
PD15 PD14 PD13 PD12 PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0
WD
15
WD
GRAM Setting
Bitmap data for G1
Bitmap data for G2
Bitmap data for G3
Bitmap data for G4
Bitmap data for G237
Bitmap data for G238
Bitmap data for G239
Bitmap data for G240
14
RAM write data (WD17-0) The pin assignment for DB17-0 varies for each interface (see below).
WD
13
:
WD
12
WD
11
WD
10
WD
9
WD
8
WD
7
WD
6
WD
5
WD
4
Preliminary
WD
3
WD
2
WD
1
WD
0