hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 137

• 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
Screen -split Drive Function
The HD66789 allows selectively driving two screens at arbitrary positions with the screen-drive position
registers (R42 and R43). Only the raster-rows required to display two screens at arbitrary positions are
selectively driven to reduce power consumption.
The first screen drive position register (R42) specifies the start line (SS17-10) and the end line (SE17-10)
for displaying the first screen. The second screen drive position register (R43) specifies the start line
(SS27-20) and the end line (SE27-20) for displaying the second screen. The second screen control is
effective when the SPT bit is set to 1. The total number of raster-rows driven for displaying the first and
second screens must be less than the number of liquid crystal drive raster-rows.
Rev.0.12, May 09 2003, page 137 of 156
G26
G42
G7
G1
The number of driven raster-rows : NL4-0 = “11110” (240 raster-rows)
1
2
st
nd
screen setting : SS17-10 = “00”H, SS17-10 = “06”H
screen setting : SS27-20 = “19”H, SS27-20 = “29”H, SPT = “1”
Screen-split Drive
1st Screen:
7 raster-row
driving
2nd Screen:
17 raster-row
driving
Non-display
ar ea
Non-display
ar ea
Preliminary