pcf8833 NXP Semiconductors, pcf8833 Datasheet - Page 62

• Manufacturer Part Number: pcf8833
• Description: Stn Rgb - 132 X 132 X 3 Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.1.3
Different display data formats are available because
different colour depths are supported by the PCF8833.
The colour depths supported are as follows:
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.
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
7.2.1
The PCF8833 has an integrated 132
(RGB) image with a 12-bpp resolution (4 kbyte colour) to be stored on-chip.
2003 Feb 14
1st write
2nd write
3rd write
1st write
2nd write
1st write
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.
STN RGB - 132
Display data RAM and access arbiter
BYTE
BYTE
BYTE
D
D
ISPLAY DATA FORMATTING
ISPLAY DATA
RAM
D/C
D/C
D/C
1
1
1
1
1
1
132
R
G
R
G
R
B
7
7
7
3
3
3
4
2
2
132
3 driver
12-bit single port static RAM. This 209 kbit memory allows a 132
R
G
R
G
R
B
6
6
6
2
2
2
3
1
1
R
G
R
G
R
B
62
5
5
5
1
1
1
2
0
0
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.
R
G
R
G
B
B
4
4
4
0
4
0
0
1
2
G
R
R
G
B
B
3
3
3
3
3
3
3
0
1
G
R
G
G
B
B
2
2
2
2
2
2
2
5
0
Objective specification
G
R
G
B
B
B
PCF8833
1
1
1
1
1
1
1
1
4
G
R
G
B
B
B
132
0
0
0
0
0
0
0
0
3