RM0319 datasheet(279/368 Pages) STMICROELECTRONICS

279 / 368 page

RM0319

LCD display controller (CLCD)

Doc ID 022640 Rev 3

279/368

The palette RAM is a dual port RAM with independent controls and addresses for each port.

Port1 is used as a read/write port and is connected to the AMBA AHB slave interface. The

palette entries can be written and verified through this port. Port2 is used as a read-only port

and is connected to the unpacker and gray scaler.

Table 85 shows the bit representation of each word in the palette.

For mono STN mode only the red palette field bits [4:1] are used. However, in STN color

mode, the green and blue [4:1] are also used.

The red and blue pixel data can be swapped to support BGR data format using a control

In 16 and 24 bpp TFT mode, the palette is bypassed and the output of the pixel serializer is

used as the TFT panel data.

24.4.6

Gray scaler

A patented gray scale algorithm drives mono and color STN panels. This provides 15 gray

scales for mono displays. In the case of STN color displays, the three color components

(red, green, and blue) are gray scaled simultaneously which results in 3 375 (15x15x15)

colors being available. The gray scaler transforms each 4 bit gray value into a sequence of

activity-per-pixel over several frames, relying to some degree on the display characteristics,

to give the representation of gray scales and color.

24.4.7

Upper and lower panel formatters

Each formatter consists of three 3-bit (red, green, and blue) shift left registers. Red, green

and blue pixel data bit values from the gray scaler are concurrently shifted into the

respective registers. When enough data is available, a byte is constructed by multiplexing

the registered data to the correct bit position to satisfy the RGB data pattern of LCD panel.

The byte is transferred to the three-byte FIFO which has enough space to store eight color

pixels.

Table 85.

Palette data storage

Bit

Name

Description

[31]

Intensity/unused

[30:26]

B[4:0]

Blue palette data

[25:21]

G[4:0]

Green palette data

[20:16]

R[4:0]

Red palette data

[15]

Intensity/unused

[14:10]

B[4:0]

Blue palette data

[09:05]

G[4:0]

Green palette data

[04:00]

R[4:0]

Red palette data

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