hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 138

• 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
Notes to the setting of 1st/2nd screen drive position registers
When making settings for the start line (SS17-10) and end line (SE17-10) of the first screen drive position
register (R42), and the start line (SS27-20) and end line (SE27-20) of the second screen drive position
register (R43) with the HD66789, it is necessary to satisfy the following conditions to display screens
correctly.
One-screen Drive (SPT = 0)
Register Settings
(SE17-10) - (SS17-10) = NL
(SE17-10) - (SS17-10) NL
(SE17-10) - (SS17-10) ! NL
Note 1) SS17-10 d SE17-0 d “EF”H
Note 2) Setting disabled for SS27-20 and SE27-20.
Two-screen Drive (SPT = 1)
Register Settings
((SE17-10) - (SS17-10))
+ ((SE27-20) - (SS27-20)) = NL
((SE17-10) - (SS17-10))
+ ((SE27-20) - (S27-20)) NL
((SE17-10) - (SS17-10))
+ ((SE27-20) - (SS27-20)) ! NL
Note 1) Make sure that SS17-10 d SE17-10 SS27-20 d SE27-20 d EFH.
Note 2) Make sure that ((SE27-20) - (SS17-10)) d NL.
The setting for the driver output in the non-display area during the partial display is changeable according
to the characteristics of the display panel.
Source outputs in non-display area
PT1
Rev.0.12, May 09 2003, page 138 of 156
0
0
1
1
PT0
0
1
0
1
Source Output for Non-display Area
Positive Polarity
V31
V31
GND
High-Z
Negative Polarity
V0
V0
GND
High-Z
Display Operation
Full screen display
The area of (SE17-10) - (SS17-10) is normally displayed.
Partial screen display
The area of (SE17-10) - (SS17-10) is normally displayed.
The rest of the area is white display irrespective of data in RAM.
Setting disabled
Display Operation
Full screen display
The area of (SE27-20) - (SS17-10) is normally displayed.
Partial screen display
The area of (SE27-10) - (SS17-10) is normally displayed.
The rest of the area is white display irrespective of data in RAM.
Setting disabled
Preliminary