Motorola MC68VZ328 - 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