hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 136
![no-image](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__sml.jpg)
hd66789
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.
Datasheet
1.HD66789.pdf
(156 pages)
- Current page: 136 of 156
- Download datasheet (2Mb)
HD66789
Frame-Frequency Adjustment Function
The HD66789 incorporates frame frequency adjustment function. The frame frequency during the liquid
crystal drive is adjusted by the instruction setting (DIV, RTN) while keeping the oscillation frequency fixed.
Setting the oscillation frequency high in advance allows switching the frame frequency in accordance to the
kind of displayed picture (i.e. moving/still picture). When displaying a still picture, set the frame frequency
low to save power consumption, while setting the frame frequency high when displaying a moving picture
which requires high-speed switching of screens.
Relationship between Liquid Crystal Drive Duty and Frame Frequency
The relationship between the liquid crystal drive duty and the frame frequency is calculated by the
following formula. The frame frequency is adjusted through the instruction setting with the 1-H period
adjustment bit (RTN bit) and the operation clock division bit (DIV bit).
(Formula for the frame frequency)
Frame frequency =
Calculation Example
Number of drive raster-rows: 240
1-H period: 16 clock cycles (RTN3-0 = 0000)
Operation clock division ratio: 1 division
In this case, the R-C oscillation frequency becomes 246 kHz. Adjust the external resistor to the R-C
oscillator to 246 kHz.
Rev.0.12, May 09 2003, page 136 of 156
fosc = 60 Hz u (0 16) clock u 1 division u (240 + 16) lines = 246 (kHz)
Clock cycles per raster-row u division ratio u (Line+BP+FP)
The maximum frame frequency = 60 Hz
fosc: R-C oscillation frequency
Line: number of drive raster-rows (NL bit)
Clock cycles per raster-row: RTN bit
Division ratio: DIV bit
The number of raster-rows for the front porch: FP
The number of raster-rows for the back porch: BP
fosc
[Hz]
Preliminary
Related parts for hd66789
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ak8825](/images/no-image3.png)
Part Number:
Description:
Hd/sd Multi Format Video Encoder With 3ch Dac
Manufacturer:
AKM Semiconductor, Inc.
Datasheet:
![HD6417709S](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas Technology Corp [Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series]
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![M30291FCTHP](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
RENESAS MCU M16C FAMILY / M16C/Tiny SERIES
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![R0K505210S000BE](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas Starter Kit for RX210
Manufacturer:
Renesas Electronics Corporation.
![R0K505630S000BE](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
EVALBOARD/Renesas StarterKit for RX630
Manufacturer:
Renesas Electronics Corporation.
![R0K50563NS000BE](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
EVALBOARD/Renesas Starter Kit+ for RX63N
Manufacturer:
Renesas Electronics Corporation.
![R0K507269S000BE](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
EVALBOARD/Renesas Starter Kit
Manufacturer:
Renesas Electronics Corporation.
![Y-PG-FP5-EE](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
FLASH PROGRAMMER FOR RENESAS MICROCONTROLLERS
Manufacturer:
Renesas Electronics Corporation.
![HA1127](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![HA17747](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![UPD3799CY](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![UPD3719D](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![UPD3778CY](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![UPD3777CY](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![UPD3798CY](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet: