hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 122

• 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
8-color Display Mode
The HD66789 incorporates 8-color display mode. The available grayscale levels are V0 and V31, and the
voltages for the other levels (V1-V30) are halted to reduce power consumption.
The J-fine-adjustment registers, PKP0-PKP5 and PKN0-PKN5 are not available in the 8-color display
mode. Since the power supply for the levels V1-V30 are halted, RGB data in GRAM should be set to
either “000000” or “111111” before setting this mode so that V0 or V31 is selected.
Rev.0.12, May 09 2003, page 122 of 156
Negative
Polarity
Register
VRP
VRN
Positive
Polarity
Register
14
14
VRP
VRP
VRN
VRN
Display
data
03
13
03
13
PKP
PKP
PKP
PKP
PKP
PKP
PRP
PRP
VRP
VRP
PKN
PKN
PKN
PKN
PKN
PKN
PRN
PRN
VRN
VRN
02
12
22
32
42
52
02
12
02
12
02
12
22
32
42
52
02
12
02
12
PKP
PKP
PKP
PKP
PKP
PKP
PRP
PRP
VRP
VRP
PKN
PKN
PKN
PKN
PKN
PKN
PRN
PRN
VRN
VRN
MSB
R
01
11
21
31
41
51
01
11
01
11
01
11
21
31
41
51
01
11
01
11
5
PKP
PKP
PKP
PKP
PKP
PKP
PRP
PRP
VRP
VRP
PKN
PKN
PKN
PKN
PKN
PKN
PRN
PRN
VRN
VRN
R
4
00
10
20
30
40
50
00
10
00
10
00
10
20
30
40
50
00
10
00
10
R
3
8
R
2
Grayscale control
R
1
2
R
0
V0
V31
G
Graphics RAM(GRAM)
5
2 - level grayscale
control
G
4
LCD driver
R G B
G
3
6
<R>
G
2
G
1
2 - level grayscale
control
LCD
G
LCD driver
0
B
6
<G>
5
B
4
2 - level grayscale
control
B
3
LCD driver
B
2
6
<B>
B
1
Preliminary
LSB
B
0