ASX340AT_16 Datasheet, PDF (33/54 Pages) ON Semiconductor – 1/4‐inch Color CMOS NTSC/PAL Digital Image SOC

ASX340AT
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.
ROM 15 14 13 12 11 10 9 8 7
0x00 ^{0 0 0 0 0 0 0 0 0}
0x02
0x04
0x06
0000
0000
0000
00
00
01
000
111
111
0x08
0x0a
0x0c
0x0e
0x10
0000
0001
0001
0011
0011
11
11
11
11
10
111
100
000
000
000
0x12 0 0 1 1 1 0 0 0 0
0x14 0 1 1 1 1 0 0 0 0
0x16 ^{0 1 1 1 0 0 0 0 0}
0x18 ^{0 1 1 1 0 0 0 0 0}
0x1a ^{0 1 1 1 0 0 0 0 0}
0x1c 0 1 1 1 0 0 0 0 0
0x1e 0 1 1 1 0 0 0 0 0
0x20 0 1 1 1 0 0 0 0 0
0x22 0 1 1 1 0 0 0 0 0
0x24 0 1 1 1 0 0 0 0 0
0x26 0 1 1 1 0 0 0 0 0
0x28 0 0 1 1 1 0 0 0 0
0x2a ^{0 0 1 1 1 0 0 0 0}
0x2c 0 0 1 1 1 0 0 0 0
0x2e 0 0 1 1 1 1 0 0 0
0x30 ^{0 0 0 1 1 1 0 0 0}
0x32 0 0 0 1 1 1 1 0 0
0x34 0 0 0 0 1 1 1 1 1
0x36 0 0 0 0 0 1 1 1 1
0x38 0 0 0 0 0 0 1 1 1
0x3a 0 0 0 0 0 0 0 0 0
0x3c ^{0 0 0 0 0 0 0 0 0}
0x3e 0 0 0 0 0 0 0 0 0
…
65 43 2 10
000 0000
000 0000
100 0000
110 0000
111
111
011
001
0000
1000
1100
1100
001 1 00
001 1110
000
000
000
000
1110
1110
1110
1110
000 1110
000 1110
000 1110
000
000
000
1110
1110
1110
000 1110
001 1110
001
001
011
1100
1100
1000
111 1000
111 0000
110 0000
100
000
000
0000
0000
0000
000 0000
Figure 32. Example of Character Descriptor 0 Stored in 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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