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參數資料
| 型號： | 935176920112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDSO24 |
| 封裝： | PLASTIC, SOT-137-1, SO-24 |
| 文件頁數： | 3/66頁 |
| 文件大小： | 445K |
| 代理商： | 935176920112 |
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1995 Jan 19
11
Philips Semiconductors
Preliminary specication
Stand-alone OSD
PCA8515
8
DISPLAY RAM ORGANIZATION
The display RAM is organized as 256
× 13 bits. The
general format of each RAM location is as follows.
Bits <12-5> hold character data and allow a choice from
253 customer designed character fonts to be selected or
one of three reserved codes. Bits <4-0> contain the
attributes of the character font, for example colour,
character size etc.
8.1
Description of display RAM codes
There are four data formats for display RAM code:
1. Character Font Code
2. Test Code
3. Carriage Return Code
4. Space Code.
The above data formats allow great flexibility in the
creation of On Screen Displays; see Fig.8.
8.1.1
CHARACTER FONT CODE
If bits <12-5> are in the range (00H to FCH), then this is a
Character Font Code. 1 of 253 customer designed
character fonts can be selected. Bits <4-1> determine the
colour of the character, a choice of 16 colours being
available. Bit <0> determines whether the character blinks
or not. The format of the Character Font Code is shown in
Table 2.
8.1.2
TEST CODE
If bits <12-5> hold FDH, then this is a special code
reserved for testing purposes only.
8.1.3
CARRIAGE RETURN CODE
If bits <12-5> hold FEH, then this is the Carriage Return
Code. A transparent pattern will be displayed on the
screen and the next character will be displayed at the
beginning of the next line. Bits <4-3> select the size of the
of the characters to be displayed on the next line.
Bits <2-1> determine the spacing between lines of
displayed characters. Bit <0> is the End-of Display bit and
indicates the end of display of the current screen before
exhaustion of display RAM (i.e. before the 256th RAM
location). The format of the Carriage Return Code is
shown in Table 3.
8.1.4
SPACE CODE
If bits <12-5> hold FFH, then this is the Space Code. A
transparent pattern, equal to one character width, will be
displayed on the screen. A mask programmable option is
available that allows the space character to be transparent
or to have a programmable background colour;
see Section 13.1. Bits <4-1> determine the background
colour of the characters that follow the Space Code in both
the Box shadowing and North West shadowing modes.
Bit <0> is the Active Character Monitor (ACM)
enable/disable bit. The ACM signal is specifically for use in
camrecorder applications where part of the display is to be
recorded on tape and displayed on the screen, whilst the
remaining part is for display only. Figure 9 shows a typical
ACM application. During the back-tracing period R, G, B, I,
FB and ACM are inactive. The format of the Space Code
is shown in Table 4.
Table 2 Format of Character Font Code
Table 3 Format of Carriage Return Code
Table 4 Format of Space Code
12
11
10
987654321
0
C7
C6
C5
C4
C3
C2
C1
C0
T4
T3
T2
T1
T0
Character Font Code (00H - FCH)
Foreground colour
Blink
12
11
10
9876543210
C7
C6
C5
C4
C3
C2
C1
C0
T4
T3
T2
T1
Carriage Return Code (FEH)
Character size
Line Spacing
End
12
11
10
987654321
0
C7
C6
C5
C4
C3
C2
C1
C0
T4
T3
T2
T1
T0
Space Code (FFH)
Background colour
ACM
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