SED1330F Datasheet, PDF (32/148 Pages) List of Unclassifed Manufacturers – LCD Controller ICs

3.0 Command Description
3.2.1.6 – 3.2.1.9
3.2.1.6 IV
3.2.1.7 T/L
Screen origin compensation for inverse display. IV is
usually set to 1.
Selects TV or LCD mode. When TV mode is selected,
the TV sync generator circuit is ON.
The best way of displaying inverted characters is to
Exclusive-OR the text layer with the graphics back-
ground layer. However, inverted characters at the top
or left of the screen are difficult to read as the charac-
ter origin is at the top-left of its bitmap and there are no
background pixels either above or to the left of these
characters.
The IV flag causes the SED1330F/1335F/1336F to
offset the text screen against the graphics back layer
by one vertical pixel. Use the horizontal pixel scroll
function (HDOT SCR) to shift the text screen 1 to 7
pixels to the right. All characters will then have the
necessary surrounding background pixels that en-
sure easy reading of the inverted characters.
T/L = 0: LCD mode
T/L = 1: TV mode
3.2.1.8 DR
Selects output of an additional shift-clock cycle for
every 64 pixels. The extra cycles are required for
correct operation of the enable chain when using a
two-panel display.
DR = 0: Normal operation
DR = 1: Additional shift-clock cycles
See Section 5.5 for information on scrolling.
IV = 0: Screen top-line correction
IV = 1: No screen top-line correction (no
offset)
Display start point
IV
Back layer
HDOT SCR
Character
1 dot
Dots 1 to 7
Figure 11. IV and HDOT SCR adjustment
3.2.1.9 FX
Sets the width, in pixels, of the character field. The
character width in pixels is equal to FX + 1, where FX
can range from 00 to 07H inclusive. If data bit 3 is set
(FX is in the range 08 to 0FH) and an 8-pixel font is
used, a space is inserted between characters. Note
that the maximum character width in TV mode is eight
pixels.
Table 4. Horizontal character size selection
HEX
00
01
↓
07
FX
D3 D2 D1 D0
0000
0001
↓↓↓↓
0111
[FX] character width
(pixels)
1
2
↓
8
Since the SED1330F/1335F/1336F handles display
data in 8-bit units, characters larger than 8 pixels wide
must be formed from 8-pixel segments. As Figure 12
shows, the remainder of the second eight bits are not
displayed. This also applies to the second screen layer.
In graphics mode, the normal character field is also
eight pixels. If a wider character field is used, any
remainder in the second eight bits is not displayed.
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