參數(shù)資料
型號： PCA84C646
廠商： NXP Semiconductors N.V.
英文描述： Microcontrollers for TV tuning control and OSD applications(應(yīng)用于TV調(diào)頻和OSD的微控制器)
中文描述： 微控制器的控制和調(diào)整（應(yīng)用于電視調(diào)頻和OSD的微控制器應(yīng)用的電視OSD）
文件頁數(shù)： 23/72頁
文件大?。?/td> 564K
代理商： PCA84C646
1995 Jun 15
23
Philips Semiconductors
Preliminary specification
Microcontrollers for TV tuning
control and OSD applications
PCA84C646; PCA84C846
11 CHARACTER ROM
Each character font is stored in the on-chip character ROM
in a 12
×
19 dot matrix. However, only elements in Rows 1
to 18 (12
×
18 dot matrix) can be selected as visible dots
on the screen.
Row 0 is only used for the combination of two characters
in a vertical direction when North-west shadowing mode is
selected (for details see Section 12.4). Row 0 contains the
same bit pattern of Row 18 of the character above it. If no
combined character in vertical direction is intended for this
character, Row 0 should be filled with all zeros.
11.1
Character ROM organization
ROM is divided into two parts: ROM1 and ROM2. The
organization of the bit patterns stored in ROM1 and ROM2
and the file format to submit to Philips for customized
character sets is shown in Fig.17.
A software package (OSDGEM) that assists in the design
of character fonts on-screen and that also automatically
generates the bit pattern HEX files is available on request.
The package is run under the MS-DOS environment for
IBM compatible PCs.
Regarding Fig.17 the following points should be noted.
1.
Row 0 of each font is reserved for vertical combination
of two fonts.
Binary 1 denotes visual dots.
ROM1 and ROM2 data files are in INTEL hex format
on a byte basis. Each byte is structured High nibble
followed by Low nibble.
The unused last byte of each font in ROM1 must be
filled with FFH.
The unused last 2
1
2
bytes in ROM2 must be filled with
the same data as held in the corresponding address in
ROM1.
The data bytes of the last 2 reserved fonts (Carriage
Return and Space Codes) should be filled with 00H.
CS denotes Checksum.
2.
3.
4.
5.
6.
7.
handbook, full pagewidth
11 10 9 8 7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Column
ROW
L
M
ROM1
ROM2
ROM1
ROM2
ROM1
ROM2
ROM1
ROM2
ROM1
ROM2
ROM1
ROM2
ROM1
ROM2
ROM1
ROM2
ROM1
ROM2
ROM1
0 0 0
3 F C
2 2 0
2 2 0
3 F C
2 2 0
2 2 0
3 F C
2 2 0
2 2 0
3 F F
0 0 1
0 0 1
5 5 3
5 5 2
0 0 6
0 0 C
0 5 8
0 3 0
0 0 0
2 2 0
3 F C
2 2 0
2 2 0
3 F F
0 0 1
5 5 2
0 0 C
0 3 0
ROM1
ROM2
3 F C
2 2 0
3 F C
2 2 0
0 0 1
5 5 3
0 0 6
0 5 8
ROM1
: 1 0 0 0 0 0 0 0 00 00 22 FC 03 22 20 F2 3F 01 20 55 0C 00 03
: 1 0 0 0 1 0 0 0 < - - - DATA FOR FONT 2 - - - 12 34>
: 1 0 0 0 2 0 0 0 < - - - DATA FOR FONT 3 - - - 56 78>
byte #
0 1 2 3 4 5 6 7 8 9 A B C D E F
F F
F F
F F
ROM2
: 1 0 0 0 0 0 0 0 FC 03 22 20 C2 3F 20 12 00 53 65 00 58
: 1 0 0 0 1 0 0 0 < - - - DATA FOR FONT 2 - - - >
: 1 0 0 0 2 0 0 0 < - - - DATA FOR FONT 3 - - - > 5 X 78 FF
0 0 03 FF
>
>
1 X 34 FF
>
2 2 0
CS
CS
CS
CS
CS
CS
MLB760
Fig.17 Font pattern stored in character ROM1 and ROM2.
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