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ASX340AT Datasheet(PDF) 33 Page - ON Semiconductor

Part # ASX340AT
Description  1/4?릋nch Color CMOS NTSC/PAL Digital Image SOC
PDF  54 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ASX340AT Datasheet(HTML) 33 Page - ON Semiconductor

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ASX340AT
www.onsemi.com
33
Character Generator
The character generator can be seen as the fifth top layer,
but instead of getting the source from RLE data in the
memory buffers, it has 16 predefined characters stored in
ROM.
All the characters are 1-bit depth color and are sharing the
same YCbCr look up table.
0x00
0x02
0x04
0x06
0x08
0x0a
0x0c
0x0e
0x10
0x12
0x14
0x16
0x18
0x1a
0x1c
0x1e
0x20
0x22
0x24
0x26
0x28
0x2a
0x2c
0x2e
0x30
0x32
0x34
0x36
0x38
0x3a
0x3c
0x3e
…
Figure 32. Example of Character Descriptor 0 Stored in ROM
0000
00
000
000
0000
0000
00
000
000
0000
0000
00
111
100
0000
0000
01
111
110
0000
0000
11
111
111
0000
0001
11
100
111
1000
0001
11
000
011
1100
0011
11
000
001
1100
0011
10
000
001
1
0 0
0011
10
000
001
1110
0111
10
000
000
1110
0111
00
000
000
1110
0111
00
000
000
1110
0111
00
000
000
1110
0111
00
000
000
1110
0111
00
000
000
1110
0111
00
000
000
1110
0111
00
000
000
1110
0111
00
000
000
1110
0111
00
000
000
1110
0011
10
000
000
1110
0011
10
000
001
1110
0011
10
000
001
1100
0011
11
000
001
1100
0001
11
000
011
1000
0001
11
100
111
1000
0000
11
111
111
0000
0000
01
111
110
0000
0000
00
111
100
0000
0000
00
000
000
0000
0000
00
000
000
0000
0000
00
000
000
0000
15 14 13 12 11 10 9 8 7 6 5
4 3 2 1 0
ROM
It can show a row of up to 22 characters of 16 x 32 pixels
resolution (32 x 32 pixels when blended with the BT 656
data).
Character Generator Details
TABLE 26. CHARACTER GENERATOR DETAILS
Item
Quantity
Description
16-bit character
22
Code for one of these characters: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, /, (space), :, –, (comma), (period)
1 bpp color
1
Depth of the bit map is 1 bpp
It is the responsibility of the user to set up proper values
in the character positioning to fit them in the same row (that
is one of the reasons that 22 is the maximum number of
characters).
NOTES: No error is generated if the character row
overruns the horizontal or vertical limits of the
frame.



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