HD66789 Datasheet, PDF (10/156 Pages) Renesas Technology Corp – 528-channel, One-chip Driver for Amorphous TFT Panels with 262,144-color display RAM, Power Supply Circuit, and Gate Circuit

HD66789
Signals
ENABLE
Number I/O
of Pins
1
I
VSYNC
1
I
HSYNC
1
I
DOTCLK
1
I
PD0~PD17
18
I
RESET*
S1~S528
1
I
528
O
G1~G240
240
O
Vcom1, Vcom2 2
O
Preliminary
Connected Functions
to
MPU
EPL ENABLE VLD
0
0
0
0
0
1
0
1
*
1
0
*
1
1
0
1
1
1
RAM Write
Valid
Invalid
Invalid
Invalid
Valid
Invalid
RAM Address
Updated
Updated
Held
Held
Updated
Updated
MPU
MPU
MPU
MPU
MPU or
reset circuit
Liquid
Crystal
Liquid
Crystal
TFT
common
electrode
Frame synchronizing signal.
This signal is active low.
Must be fixed at the IOVcc level while not used.
Line synchronizing signal.
This signal is active low.
Must be fixed at the IOVcc level while not used.
Dot-clock signal.
This signal is active low.
The timing of data input is determined at the falling edge of the
signal. Must be fixed at the IOVcc level while not used.
18-bit bus for RGB data.
6-bit bus: PD17-PD12
16-bit bus: PD17-PD13 and PD11-PD1
18-bit bus: PD17-PD0
Fix unused pins to the IOVcc or GND level.
Reset pin.
Initializes the LSI at the “Low” level.
Power-on reset required after turning on the power.
Output voltage applied to liquid crystal.
The shift direction of segment signals is changeable with SS bit.
For example, if SS = 0, RAM address “0000” is output from S1.
If SS = 1, it is output from S528.
S1, S4, S7, ... display red (R), S2, S5, S8, ... display green (G),
and S3, S6, S9, ... display blue (B) (SS = 0).
Gate output signals.
When gate lines are selected, VGH signals are output. When
gate lines are not selected, VGL are output.
Power supply for TFT common electrode.
When Vcom AC drive is not selected, the same level of voltage
as VcomL level is output. When Vcom AC drive is selected, the
voltage with the amplitude between VcomH and VcomL is
output. The AC frequency can be set by the M signal.
Connect to the TFT common electrode.
Rev.0.12, May 09 2003, page 10 of 156