參數(shù)資料
型號： ST92186B3BK
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封裝： PLASTIC, SDIP-32
文件頁數(shù)： 135/148頁
文件大?。?/td> 1664K
代理商： ST92186B3BK
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ST92186B - ON SCREEN DISPLAY CONTROLLER (OSD)
OSD CONTROLLER (Cont’d)
7.4.3.11 Translucency Function
The translucency feature is designed to provide a
better OSD quality while displaying rows in mixed
mode.
Instead of forcing the background color of any
character to any full intensity color, (which will pre-
vent the viewer from seeing a significant amount of
the video picture), or having a fully transparent
background (i.e. no background) which makes the
OSD more difficult to read for the viewer, the trans-
lucency provides a real time mix between both the
video and the OSD background information. This
feature will appear as a “boxing” effect around all
the displayed characters.
The translucency can be handled in two different
ways at application level, depending on the video
processor used in the application.
1. When the video processor accepts an analog
control of the fast switch OSD signal (called
“FB”), the translucency can be handled directly
through the real time amplitude of the FB signal
(refer to Color attribute control for Border, Back-
ground palette and Underline color settings).
2. When the video processor accepts only a digital
FB signal, the translucency function may be im-
plemented on the chassis with the help of an
additional digital output of the MCU, which is
provided as an I/O pin alternate function.
This digital output called “TSLU” is active (set to
“1”) when the OSD displays the Background and
Foreground or when the mute is active (refer to the
description of the LSM[2:0] bits in the OSDMR reg-
ister) and is inactive the rest of the time (during
foreground or if no display), including character
00h.
This TSLU signal is controlled by the TSLE bit in
the OSDER register. When not used, (TSLE=0),
the TSLU signal is held at “1” by hardware.
Application Note
In order to enable the Translucency Function (See
Example No. 2, above), the following procedure
must be performed:
– Fast Blanking must be set to Digital mode. Set bit
DIFB (bit 7) of register OSDBCR1 (R247, page
42) to 1. Refer to Section 7.4.8 Register Descrip-
tion.
– Initialize port 3.0 as a push-pull type Alternate
Function output. Refer to Section 6.5.3 Pin De-
clared as an Alternate Function Output.
– Set bit TSLE (bit 2) of register OSDER (R248,
page 42) to 1. Refer to Section 7.4.8 Register
Description.
– For the selected colors (i.e. those which will ap-
pear as transparent with contrast reduction), set
bits BT[2:0] to 0. Refer to Section 7.4.6.4 Back-
ground Palettes.
Figure 49. Digital Translucency Output Pin Example
A
Current displayed video line
TLSU Digital Output
FB (active high)
No display
Foreground
No display
Transparent Background
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