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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： | 30/66頁 |
| 文件大小： | 445K |
| 代理商： | 935176920112 |
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1995 Jan 19
36
Philips Semiconductors
Preliminary specication
Stand-alone OSD
PCA8515
10 MISCELLANEOUS
10.1
Space and Carriage Return Codes in different
Background/Shadowing modes.
Figures 30 to 34 show the Space Code and Carriage
Return Code in the 4 different Background/Shadowing
modes.
Mode 0: the No background mode. Both the Space
Code and the Carriage Return Code are displayed as
transparent (no bit) patterns with the video signal as the
background. This is shown in Fig.30.
Mode 1: the North West shadowing mode. Both codes
are displayed in the same manner as for Mode 0. This is
shown in Fig.31.
Mode 2: the Box shadowing mode. The Space Code is
displayed as an opaque pattern with a selected
background colour. This will also be the background
colour of the character following the Space Code. The
Carriage Return Code however, is displayed as a
transparent (no bit) pattern superimposed on the video
signal. This is shown in Fig.32.
The Space Code can also be displayed as a transparent
pattern on the video signal, and this is shown in Fig.33.
The choice of whether the Space Code displays an
opaque pattern or a transparent pattern is mask
programmable.
Mode 3: the Frame shadowing mode. The Space Code
and Carriage Return Code are displayed as transparent
patterns with background colour. This is shown in
Fig.34.
10.2
Combination of character font cells
Two (or more) character font cells may be combined in a
horizontal or vertical direction to create a new higher
resolution pattern.
The combination of two cells in a horizontal direction is
straight forward and requires no special precautions to be
taken. When combining character cells in this manner all 4
Background/Shadowing modes are available. An example
of combining two character font cells in a horizontal
direction is shown in Fig.35.
However, the combination of two character font cells in a
vertical direction is more difficult and care must be taken;
otherwise, the new pattern may be created with gaps in its
shadowing. An example of a character pattern with gaps is
shown in Fig.37. Providing the steps listed below are
followed no problems with shadowing will occur.
The line spacing between two rows of characters must
be programmed to 0H. This procedure is explained in
Section 9.3.2.
If the North-West shadowing mode is selected then
when combining two character cells in a vertical
direction Row 0 must contain the same bit pattern as
held in Row 18 of the character directly above it. This is
shown in Fig.38.
If North-West shadowing is not required then Row 0
should contain all zeros.
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