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參數(shù)資料
| 型號： | STV9425B |
| 廠商： | 意法半導體 |
| 英文描述： | MULTISYNC ON-SCREEN DISPLAY FOR MONITOR |
| 中文描述： | 多頻屏幕的監(jiān)視器顯示 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 184K |
| 代理商： | STV9425B |
FUNCTIONAL DESCRIPTION
(continued)
Figure 5 :
HorizontalTiming
H-SYNC
0
1
2
3
n + 1
n + 2
n + 3
n + 4
LD - 1
LD
0
1
Character
Period
R, G, B
LD[5:0]
Fixed
DD[7:0]
Given by number
of characters of the strips
= 4 (min)
= 4n + 2
9
IV- Clock and Timing
The whole timing is derived from the XTALIN and
the SYNCHRO (horizontal and vertival) input fre-
quencies.The XTALIN input frequency can be an
external clock or a crystal signal thanks to
XTALIN/XTALOUT pins. The value of this fre-
quencycan be chosenbetween8 and15MHz,it is
availableontheCKOUTpin andis usedbythePLL
to generate a pixel clock locked on the horizontal
synchroinput signal.
IV.1- Horizontal Timing
(seeFigure 5)
The number of pixel periods is given by the LINE
DURATION registerand is equalto :
[LD[5:0]+ 1 ] x 12.
(LD[5:0] : valueof the LINE DURATION register).
This value allows to choose the horizontal size of
the characters. The horizontal left margin is given
by the HORIZONTAL DELAYregister and is equal
to :
[DD[7:0] + 8] x 3 x T
PXCK
(DD[7:0] : value of the DISPLAY DELAY register
andT
PXCK
: pixel period).
Thisvalue allowsto choosethe horizontalposition
of the characters on the screen. The value of
DD[7:0] must be equal or greater than4 (themini-
mumvalueof thehorizontaldelayis 36xT
PXCK
= 3
character periods). The length of the active area,
whereR, G, B aredifferentfrom 0, dependson the
numberof charactersof the strips.
IV.2- D to A Timing
The D to Aconverters of the STV9425/25B/26are
pulsewidth modulaterconverter.The frequencyof
the output signal is :F
XTAL
256
and the duty cycle is :Vi[7:0]
256
per cent.
After a low pass filter, the average value of the
outputis :Vi
[7:0]
256
V
DD
V - DisplayControl
Ascreeniscomposedofsuccessivescanlinesgath-
ered in several strips. Each strip is defined by a
descriptor stored in memory. A tableof descriptors
allows screen composition and different tables can
bestoredin memoryat thepageaddresses(8pos-
sible
≠
addresses).Twotypesofstripsareavailable :
- Spacing strip : its descriptor (see II) gives the
numberof black(FBK= 1inDISPLAYCONTROL
register) or transparent(FBK = 0) lines.
- Character strip : its descriptor gives the memory
addressof thecharactercodescorrespondingto
the 1
st
displayed character. The characters and
attributes (see code format III) are defined by a
succession of codes stored in the RAM at ad-
dresses starting from the 1
st
one given by the
descriptor. A character strip can be displayed or
not by using the DE bit of its descriptor. A zoom
can be made on it by using the ZY bit.
0
1
128
255
V1[7:0]
T
XTAL
256.T
XTAL
PWM1 Signal
9
Figure 6 :
PWMTiming
STV9425 - STV9425B - STV9426
9/15
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| STV9425-STV9425B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MULTISYNC ON-SCREEN DISPLAY FOR MONITOR |
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| STV9427 | 制造商:STMicroelectronics 功能描述:STV9427 - Bulk |
| STV9428 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH SPEED MULTISYNCH ON-SCREEN DISPLAY FOR MONITOR |
| STV9428-STV9429 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH SPEED MULTISYNCH ON-SCREEN DISPLAY FOR MONITOR |
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