PCF8833USLASH2DA datasheet(62/112 Pages) PHILIPS

62 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

7.1.3

DISPLAY DATA FORMATTING

Different display data formats are available because

different colour depths are supported by the PCF8833.

The colour depths supported are as follows:

• 4 kbyte colours (12-bit/pixel), RGB 4 :4:4 bits input;

see Table 82. The data coming from the interface is

directly stored in RAM.

• 65 kbyte colours (16-bit/pixel), RGB 5 : 6 : 5 bits input;

see Table 83. The 16-bit data coming from the interface

is mapped by means of dithering to 12-bit data. The

dithered 12-bit data is then stored in the RAM.

• 256 colours (8-bit/pixel), RGB 3:3:2 bits input; see

Table 84. The 8-bit data coming from the interface is

mapped by means of the Look-Up Table (LUT) (see

Section 6.2.22) to 12-bit data. The mapped 12-bit data

is then stored in the RAM.

There are 3 bytes used to define 2 pixels with the 12-bit

colour depth information; see Table 82. The most

significant bits are R3, G3 and B3. Data is transferred to

the RAM only when all the information i.e. RGB data of that

particular pixel is sent.

There are 2 bytes used to transfer 1 pixel with the 16-bit

colour depth information; see Table 83. The most

significant bits are R4, G5 and B4. When the data transfer

is stopped after the first write, the data is not transferred to

the display data RAM. The 16-bit data coming from the

interface is mapped by means of dithering to 12-bit data.

The dithered 12-bit data is then stored in the RAM.

In one byte, 1 pixel is transferred with the 8-bit colour

depth information; see Table 84. The most significant bits

are R2, G2 and B1. The 8-bit data coming from the

interface is mapped by means of a look-up table (see

Section 6.2.22) to 12-bit data. The mapped 12-bit data is

then stored in the RAM.

Table 82 Write data for RGB 4 :4:4 bits input

Table 83 Write data for RGB 5 :6:5 bits input

Table 84 Write data for RGB 3 :3:2 bits input

7.2

Display data RAM and access arbiter

7.2.1

DISPLAY DATA RAM

The PCF8833 has an integrated 132

× 132 × 12-bit single port static RAM. This 209 kbit memory allows a 132 × 132

(RGB) image with a 12-bpp resolution (4 kbyte colour) to be stored on-chip.

BYTE

D/C

6543210

1st write

2nd write

3rd write

BYTE

D/C

6543210

1st write

2nd write

BYTE

D/C

6543210

1st write

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