Figure 7-6. Programming For One-Third Luminous Intensity; Table 7-7. Programming 50% Duty Cycle Into Lookup Table - Cirrus Logic EP93 Series User Manual

Raster Engine With Analog/LCD Integrated Timing and Interface
EP93xx User's Guide
Assuming the 3 bit input pattern that represents this 50% duty cycle grayscale is 0x3 (or
011b), the values in
7
up-table.
Frame Vert
Ctr Ctr
D18 D17
1
Since all patterns must be evaluated against their specific use, no more examples for half
intensity will be offered. Instead, another example will be used to make a walking distortion
more obvious.
Take the example of a one-third luminous intensity grayscale pattern. Assume a 3Hx3Vx3F
matrix for this definition. Wanting the intensity to be evenly distributed and given the three
frame interval, any cell in the matrix should only be active for one frame. The matrix could be
filled in as in
7-22
Table 7-7 should be used to program this pattern into the grayscale look-

Table 7-7. Programming 50% Duty Cycle Into Lookup Table

Horz VCNT (lines)
HCNT
Ctr
(pixels)
Register
D16
Address
1 1 base + 0x0C
base + 0x2C
base + 0x4C
base + 0x6C
Figure 7-6.
Frame 0
V
E
R
T
Frame 2

Figure 7-6. Programming for One-third Luminous Intensity

Copyright 2007 Cirrus Logic
1 1 1 1 1 1 1 1
1 1 1 1 0 0 0 0
1 1 0 0 1 1 0 0
1 0 1 0 1 0 1 0
D D D D D D
D D
1 1 1 1 1 1
9 8
5 4 3 2 1 0
0 1 0 1 1 1 0 0
1 0 1 0 0 0 1 1
1 1 0 0 0 1 0 1
0 0 1 1 1 0 1 0
H O R Z Frame 1
1 0 0
0 1 0
0 0 1
0 0 1
1 0 0
0 1 0
0 0 0 0 0 0 0 0
1 1 1 1 0 0 0 0
1 1 0 0 1 1 0 0
1 0 1 0 1 0 1 0
D D D D D D D D
7 6 5 4 3 2 1 0
0 1 0 1 0 0 1 1
1 0 1 0 1 1 0 0
0 0 1 1 0 1 0 1
1 1 0 0 1 0 1 0
0 1 0
0 0 1
1 0 0
GrySclLUT
Address *4
Frame Pixel
Value
00 011
01 011
10 011
11 011
DS785UM1