Cirrus-logic EP73xx Manual de usuario descargar pdf (Pagina 98)

9-8 EP7309/11/12 User’s Manual - DS508UM4

LCD Interface

GSEN[30]: Gray scale enable bit. Enables gray scale output to the LCD.

When cleared, each bit in the video map directly corresponds to a

pixel in the display.

GSMD[31]: Gray scale mode bit. Clearing this bit sets the controller to 2 bpp

(4-gray scale). Setting this bits enables 4 bpp (16-gray scale).

LCD Palette Registers

Least Significant Word (PALLSW)

Address: 0x8000.0580, Read / Write

Most Significant Word (PALMSW)

Address: 0x8000.0540, Read / Write

Bit Descriptions:

The least and most significant word of the LCD palette registers

(read/write) map the pixel value stored in the frame buffer to a

physical gray scale level. The two 32-bit registers define all gray

scale levels for a total of 4 bpp. If 2 bpp is required, only the palette

least significant word need be programmed. At 1 bpp, only the first

two nibbles in the least significant register are required to be

programmed.

Table 9-2 on page 9-8 represents the mapping of the pixel value from memory to the

gray scale value programmed into the registers.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Gray scale value for pixel value 7 Gray scale value for pixel value 6 Gray scale value for pixel value 5 Gray scale value for pixel value 4

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Gray scale value for pixel value 4 Gray scale value for pixel value 3 Gray scale value for pixel value 2 Gray scale value for pixel value 1

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Gray scale value for pixel value 15 Gray scale value for pixel value 14 Gray scale value for pixel value 13 Gray scale value for pixel value 12

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Gray scale value for pixel value 11 Gray scale value for pixel value 10 Gray scale value for pixel value 9 Gray scale value for pixel value 8

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 157 158

Sin comentarios

Cirrus-logic EP73xx Manual de usuario Pagina 98