VCT 38xxA
ADVANCE INFORMATION
3.10.Four-Color Mode
In “Four-Color Mode” the color depth of single or multi-
ple characters can be increased to 4 colors (e.g. to dis-
play icons or 3-D effects). A special font organization is
required because two consecutive characters will be
combined. The number of 4-colored characters is only
limited by font size.
odd character code, this character is combined with
itself.
The neighbor character does not change the definition
of foreground and background pixel which is used to
control flash and mix mode.
The “Four-Color Mode” is controlled via the level 2 par-
allel attribute “Color Mode”. Setting the bit CM to 1
activates the “Four-Color Mode” until the end of row or
until the bit CM is set to 0 again. At the start of each
display row the “Four-Color Mode” is disabled.
Table 3–13: Color Allocation
Pixel Definition
Color Allocation
A character with active “Four-Color Mode” attribute will
be combined with its font neighbor to define a 2
bit/pixel character matrix. The 2 additional colors are
derived from the active foreground and background
colors by inverting bit 3 of the color code. Using the
programmable part of the CLUT it is possible to display
characters in 4 out of 4096 colors.
Character Character
n
n+1
0
1
0
1
0
0
1
1
background
foreground
background .xor. 8
foreground .xor. 8
If the “Four-Color Mode” attribute is set for a character
with even character code n, this character is combined
with its font neighbor addressed by code n + 1. If the
“Four-Color Mode” attribute is set for a character with
Matrix of Character n
Matrix of Character n+1
4 Color Display
00
01
10
11
+
=
Fig. 3–18: Four-color mode
66
Micronas
MICRONAS [ MICRONAS ]
