CS89712 datasheet(102/170 Pages) CIRRUS

102 / 170 page

CS89712

102

DS502PP2

3.11.2

PALLSW Least Significant Word — LCD Palette Register (address 0x8000.0580)

The least and most significant word LCD palette registers make up a 64-bit read / write register which maps the log-

ical pixel value to a physical grayscale level. The 64-bit register is made up of 16 x 4-bit nibbles, each nibble defines

the grayscale level associated with the appropriate pixel value. If the LCD controller is operating in two bits-per-pixel,

only the lower 4 nibbles are valid (D[15:0] in the least significant word). Similarly, one bit-per-pixel means only the

lower 2 nibbles are valid (D[7:0]) in the least significant word.

3.11.3

PALMSW Most Significant Word — LCD Palette Register (address 0x8000.0540)

The pixel to grayscale level assignments and the actual physical color and pixel duty ratio for the grayscale values

are shown in Table 56. Note that colors 8

–15 are the inverse of colors 7–0 respectively. This means that colors 7

and 8 are identical. Therefore, in reality only 15 grayscales available, not 16. The steps in the grayscale are non-

linear, but have been chosen to give a close approximation to perceived linear grayscales. The is due to the eye

being more sensitive to changes in gray level close to 50% gray (See

PALLSW description).

31:28

27:24

23:20

19:16

15:12

11:8

7:4

3:0

Grayscale

value for pixel

value 7

Grayscale

value for pixel

value 6

Grayscale

value for pixel

value 5

Grayscale

value for pixel

value 4

Grayscale

value for pixel

value 3

Grayscale

value for pixel

value 2

Grayscale

value for pixel

value 1

Grayscale

value for pixel

value 0

31:28

27:24

23:20

19:16

15:12

11:8

7:4

3:0

Grayscale

value for pixel

value 15

Grayscale

value for pixel

value 14

Grayscale

value for pixel

value 13

Grayscale

value for pixel

value 12

Grayscale

value for pixel

value 11

Grayscale

value for pixel

value 10

Grayscale

value for pixel

value 9

Grayscale

value for pixel

value 8

Grayscale Value

Duty Cycle

% Pixels Lit

% Step Change

11.1%

1/9

11.1%

8.9%

1/5

20.0%

6.7%

4/15

26.7%

6.6%

3/9

33.3%

6.7%

2/5

40.0%

5.4%

4/9

44.4%

5.6%

1/2

50.0%

0.0%

1/2

50.0%

5.6%

5/9

55.6%

5.4%

3/5

60.0%

6.7%

6/9

66.7%

6.6%

11/15

73.3%

6.7%

4/5

80.0%

8.9%

8/9

88.9%

11.1%

100%

Table 56. Grayscale Value to Color Mapping

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