CL-PS7500FE 查看數據表（PDF） - Cirrus Logic

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CL-PS7500FE

System-on-a Chip for Internet Appliance

Cirrus Logic 

16.2 Video Palette: Address 0x0

CL-PS7500FE

System-on-a-Chip for Internet Appliance

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

0 0 0 0 E E E E B B B B B B B B GGGGGGGG RRRRRRRR

Red physical color

Green physical color

Blue physical color

Ext physical color

All entries of the video palette are written at address 0. To write any or all of the palette locations, the

address pointer must first be written, as described below. The palette is programmed with a 28-bit word

representing the physical data field.

16.3 Video Palette Address Pointer: Address 0x1

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

0001

XXXXXXXX

Palette location

The address pointer is programmed at address 1, and it can be programmed to any value from 0 to 255.

The first write to the palette then occurs at this location, and the address pointer post-increments so that

the next palette write occurs to the following location. The counter wraps around from 255 to 0.

Once the address pointer is written, any number of palette locations can be programmed, and the pointer

can be reprogrammed at any time if only part of the whole palette is to be updated.

142

THE VIDEO SOUND AND PROGRAMMER’S MODEL

ADVANCE DATA BOOK v2.0

June 1997

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