Table 8-1, Grey palette density -7 – Motorola MC68VZ328 User Manual
Page 135
LCD Controller Operation
LCD Controller
8-7
Since crystal formulations and driving voltages vary, the visual grayscale effect may or may not be linearly
related to the frame rate. For certain types of graphics, a logarithmic scale like zero, one-fourth, one-half,
and one might be more visually pleasing than a linearly spaced scale like zero, five-sixteenths,
eleven-sixteenths, and one. This flexible mapping scheme
allows optimizing the visual effect for the
specific panel or application during a four-level grayscale display mode.
NOTE:
The Controlling Frame Rate Modulation function available in previous
versions of the DragonBall integrated processor is not available in the
MC68VZ328.
Table 8-1. Grey Palette Density
Gray Code (Hex)
Density
Density (in Decimal)
0
0
0
1
1/8
0.125
2
1/5
0.2
3
1/4
0.25
4
1/3
0.333
5
2/5
0.4
6
4/9
0.444
7
1/2
0.5
8
5/9
0.555
9
3/5
0.6
A
2/3
0.666
B
3/4
0.75
C
4/5
0.8
D
7/8
0.875
E
14/15
0.933
F
1
1