SED1330F Datasheet, PDF (81/148 Pages) List of Unclassifed Manufacturers – LCD Controller ICs

5.2 – 5.2.2
5.2 Screen Configuration
5.2.1 Screen Configuration
The basic screen configuration of the SED1330F/
1335F/1336F is as a single text screen or as overlap-
ping text and graphics screens. The graphics screen
uses eight times as much display memory as the text
screen.
5.0 Display Control Functions
Figure 40 shows the relationship between the virtual
screens and the physical screen.
0000H
A/P
C/R
0800H
07FFH
Character
memory area
Graphics
memory area
Display
memory
window
(0,YM)
Y
(0,0)
X
47FFH
(XW,YM)
(XM,YM)
(XM,0)
Figure 48. Virtual and physical screen relationship
5.2.2 Display Address Scanning
The SED1330F/1335F/1336F scans the display memory
in the same way as a raster scan CRT screen. Each row
is scanned from left to right until the address range
equals C/R. Rows are scanned from top to bottom.
In graphics mode, at the start of each line, the address
counter is set to the address at the start of the previous
line plus the address pitch, AP.
In text mode, the address counter is set to the same
start address, and the same character data is read, for
each row in the character bitmap. However, a new row
of the character generator output is used each time.
Once all the rows in the character bitmap have been
displayed, the address counter is set to the start
address plus AP and the next line of text is displayed.
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