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Apalis Carrier Board Design Guide
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2.6.2
Color Mapping
The 24-bit color mapping is guaranteed to be compatible with other Apalis modules. R7, G7 and
B7 are the most significant bits (MSBs) and R0, G0 and B0 are the least significant bits (LSBs) for
the respective colors. To use displays which require fewer bits (e.g. 18 or 16-bit displays), simply do
not connect the bottom n LSBs for each color, where n is the number of signals that are not
required for a specific color. For instance, to connect an 18-bit display, R0, R1, G0, G1 B0, and B1
will remain unused, and R2, G2, and B2 will become the LSBs for this configuration.
Some Apalis Modules might feature additional color mappings for 18 or 16-bit displays. These
mappings might be incompatible with the 24-bit mapping of the Apalis standard. In order to keep
the design compatible, it is recommended to attach 18 or 16-bit displays to the 24-bit mapped
interface as the following table shows.
Apalis
Pin
Apalis
Signal Name
24 bit
RGB
18 bit
RGB
16 bit
RGB
251
LCD1_R0
R0
253
LCD1_R1
R1
255
LCD1_R2
R2
R0
257
LCD1_R3
R3
R1
R0
259
LCD1_R4
R4
R2
R1
261
LCD1_R5
R5
R3
R2
263
LCD1_R6
R6
R4
R3
265
LCD1_R7
R7
R5
R4
269
LCD1_G0
G0
271
LCD1_G1
G1
273
LCD1_G2
G2
G0
G0
275
LCD1_G3
G3
G1
G1
277
LCD1_G4
G4
G2
G2
279
LCD1_G5
G5
G3
G3
281
LCD1_G6
G6
G4
G4
283
LCD1_G7
G7
G5
G5
287
LCD1_B0
B0
289
LCD1_B1
B1
291
LCD1_B2
B2
B0
293
LCD1_B3
B3
B1
B0
295
LCD1_B4
B4
B2
B1
297
LCD1_B5
B5
B3
B2
299
LCD1_B6
B6
B4
B3
301
LCD1_B7
B7
B5
B4
Table 15: Parallel RGB LCD signals