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參數(shù)資料
| 型號： | SAA55xx |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Standard TV microcontrollers with On-Screen Display (OSD)(用于屏幕顯示的標(biāo)準(zhǔn)TV微控制器) |
| 中文描述： | 微控制器與標(biāo)準(zhǔn)電視屏幕顯示（OSD）（用于屏幕顯示的標(biāo)準(zhǔn)電視微控制器） |
| 文件頁數(shù)： | 62/80頁 |
| 文件大小： | 311K |
| 代理商： | SAA55XX |
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1999 Oct 27
62
Philips Semiconductors
Preliminary specification
Standard TV microcontrollers with
On-Screen Display (OSD)
SAA55xx
19.12 Video/data switch adjustment
To take into account the delay between the RGB values
and the VDS signal due to external buffering, the VDS
signal can be moved in relation to the RGB signals.
The VDSsignalcanbesettobeeitheraclockcyclebefore
or after the RGB signal, or coincident with the RGB signal.
This is done using VDEL<2:0> in the MMR Configuration.
19.13 RGB brightness control
A brightness control is provided to allow the RGB upper
output voltage level to be modified. The nominal value is
1 V into a 15
resistor, but can be varied between
0.7 and 1.2 V.
The brightness is set in the RGB Brightness Register.
Table 21
RGB brightness
19.14 Contrast reduction
The COR bits in SFRs TXT5 and TXT6 control when the
COR output of the device is activated (i.e. pulled LOW).
This output is intended to act on the TVs display circuits to
reduce contrast of the video when it is active. The result of
contrast reduction is to improve the readability of the text
in a mixed teletext and video display.
The bits in the TXT5 and TXT6 SFRs allow the display to
be set up so that, for example, the areas inside teletext
boxes will be contrast reduced when a subtitle is being
displayed but that the rest of the screen will be displayed
as normal video.
20 MEMORY MAPPED REGISTERS (MMR)
The memory mapped registers are used to control the
display. The registers are mapped into the microcontroller
MOVX address space, starting at address 87F0H and
extending to 87FFH.
Table 22
MMR address summary
BRI3 TO BRI0
RGB BRIGHTNESS
0000
...
1111
lowest value
...
highest value
REGISTER
NO.
MEMORY
ADDRESS
FUNCTION
1
2
3
4
7
8
87F1H
87F2H
87F3H
87F4H
87F7H
87F8H
87FCH
87FDH
87FFH
Text Position Vertical
Text Area Start
Fringing Control
Text Area End
RGB Brightness
Status
HSYNC Delay
VSYNC Delay
Configuration
12
13
15
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相關(guān)代理商/技術(shù)參數(shù) |
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| SAA5647 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display OSD |
| SAA5647HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display OSD |
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