HD66789 Datasheet, PDF (138/156 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
Preliminary
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
Display Operation
(SE17-10) - (SS17-10) = NL
Full screen display
The area of (SE17-10) - (SS17-10) is normally displayed.
(SE17-10) - (SS17-10) < NL
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.
(SE17-10) - (SS17-10) > NL
Setting disabled
Note 1) SS17-10 ≤ SE17-0 ≤ “EF”H
Note 2) Setting disabled for SS27-20 and SE27-20.
Two-screen Drive (SPT = 1)
Register Settings
Display Operation
((SE17-10) - (SS17-10))
+ ((SE27-20) - (SS27-20)) = NL
Full screen display
The area of (SE27-20) - (SS17-10) is normally displayed.
((SE17-10) - (SS17-10))
+ ((SE27-20) - (S27-20)) < NL
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.
((SE17-10) - (SS17-10))
+ ((SE27-20) - (SS27-20)) > NL
Setting disabled
Note 1) Make sure that SS17-10 ≤ SE17-10 < SS27-20 ≤ SE27-20 ≤ EFH.
Note 2) Make sure that ((SE27-20) - (SS17-10)) ≤ 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
Source Output for Non-display Area
PT1 PT0 Positive Polarity Negative Polarity
0
0
V31
V0
0
1
V31
V0
1
0
GND
GND
1
1
High-Z
High-Z
Rev.0.12, May 09 2003, page 138 of 156