hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 51

• 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
Power Control 3 (R12h)
Power Control 4 (R13h)
PON: Start operation of VLOUT3. To stop operation, set PON = 0. To start operation, set PON = 1.
VRH3-0: Set the scale for amplifying VLOUT1 voltage (the reference voltage for VCOM and grayscale
voltage). REGP voltage is amplified by 1.33 ~ 2.775 times.
VCOMG: When VCOMG = 1, VcomL outputs a negative voltage (1.0V ~ -Vci+0.5V Max.). When
VCOMG = 0, the amplifiers for the negative voltage is halted, thereby saving power consumption. When
VCOMG = 0, settings with VDV4-0 bits are invalid. In this case, to adjust AC amplitude of Vcom, make
settings with VCM4-0 bits (VcomH setting). VCOMG = 1 is valid when PON = 1.
VDV4-0: Set the AC amplitude of Vcom during Vcom AC drive. The amplitude can be specified within
the range of 0.6 ~ 1.23 times of VREG1OUT. When VCOMG = 0, this setting is invalid.
VCM4-0: Set the VcomH voltage (The higher voltage during Vcom AC drive). The voltage can be
specified within the range of 0.4 ~ 0.98 times of VREG1OUT. When VCM4-0 = “11111”, the internal
volume adjustment operation is halted, and the VcomH voltage can be adjust by placing an external resistor
from VcomR.
Rev.0.12, May 09 2003, page 51 of 156
R/W
W
W
RS
1
1
IB15 IB14 IB13 IB12 IB11 IB10 IB9
0
0
0
0
VCO
MG
0
VDV4
0
VDV3 VDV2 VDV1 VDV0
0
0
0
IB8
0
IB7
0
0
IB6
0
0
IB5
0
0
PON
VCM4 VCM3 VCM2 VCM1 VCM0
IB4
VRH3
IB3
VRH2 VRH1 VRH0
IB2
Preliminary
IB1
IB0