hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 37

• 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.

Source Output in the Display Area
HD66789
REV: When REV = 1, a reverse display is shown. Inverting the grayscale levels allows the display of
same data on both normally white and normally black panels. The source output during front, back porch
periods and blank periods during the 2-split-screen display is made in accordance with settings with PT1-0
bits.
REV
0
1
Note: The output on the source lines during the front and back porch periods and blanking of the partial
GON: When GON = 0, the gate-off level is GND.
DTE: When DTE = 0, the DISPTMG output is fixed to GND.
GON Bit
GON
0
1
D1–0: The graphics display is on when D1 = 1, and off when D1 = 0. When setting D1 = 0, the data are
retained in GRAM. This means the graphics is instantly redisplayed when setting D1 to 1. When D1 is 0
(i.e., the display is off) all the source outputs are set to the GND level. This reduces the charged/discharged
current on LCD, accompanied by the liquid crystal AC drive.
When D1-0 = 01, the HD66789 continues the internal display operation, even while the external display is
off. When D1-0 = 00, both the internal display operations and the external display operation are halted.
In combination with GON and DTE bits, D1-0 bits control ON/OFF of display. For details, see the
“Instruction Setting Flow” section.
Rev.0.12, May 09 2003, page 37 of 156
display is determined with PT1-0 bits.
GRAM Data
18’h00000
18’h3FFFF
18’h00000
18’h3FFFF
Gate Output
VGH/GND
VGH/VGL
Source Output in the Display Area*
Positive Polarity
V31
V0
V0
V31
DTE Bit
DTE
0
1
Negative Polarity
V0
V31
V31
V0
DISPTMG Output
Halt (GND)
Operation (Vcc/GND)
Preliminary