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參數(shù)資料
| 型號： | STV9422 |
| 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> | 232K |
| 代理商： | STV9422 |
FUNCTIONAL DESCRIPTION
(continued)
Figure 5 :
Horizontal Timing
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
ThewholetimingisderivedfromtheXTALINandthe
SYNCHRO (horizontal and vertival) input frequen-
cies.TheXTALINinputfrequencycanbeanexternal
clockor acrystalsignalthankstoXTALIN/XTALOUT
pins. The value of this frequency can be chosen
between8 and15MHz,it is availableonthe CKOUT
pinand isused bythe PLLto generatea pixelclock
lockedon thehorizontalsynchroinput signal.
IV.1 - Horizontal Timing
(see Figure 5)
The number of pixel periods is given by the LINE
DURATION register and is equalto :
[LD[5:0] + 1 ] x 12.
(LD[5:0] : valueof the LINE DURATION register).
Thisvalueallows tochoosethehorizontalsize ofthe
characters.The horizontalleft marginis given bythe
HORIZONTALDELAYregister andis equalto :
[DD[7:0] + 8] x 3 x T
PXCK
(DD[7:0] : value of the DISPLAY DELAY register
and T
PXCK
: pixelperiod).
This valueallows to choosethe horizontalposition
of the characters on the screen. The value of
DD[7:0] must be equal or greater than 4 (the mini-
mum valueof the horizontaldelayis36x T
PXCK
= 3
character periods). The length of the active area,
where R,G, B aredifferent from 0, depends onthe
number of charactersof the strips.
IV.2 - D toA Timing
(STV9422)
The D to A converters of the STV9422 are pulse
width modulaterconverter.
The frequencyof the output signal is :f
XTAL
256
and the duty cycle is :Vi[7:0]
256
percent.
After a low pass filter, the average value of the
output is :Vi [7:0]
256
V
DD
V - DisplayControl
Ascreenis composedofsuccessive scanlinesgath-
ered in several strips. Each strip is defined by a
descriptor stored in memory. A table of descriptors
allows screen composition and different tables can
be stored in memory at the pageaddresses(8 pos-
sible
≠
addresses).
Two types of strips are available:
- Spacing strip : its descriptor (see II) gives the
numberof black(FBK = 1inDISPLAYCONTROL
register) or transparent(FBK = 0) lines.
- Character strip : its descriptorgives the memory
address of the character codes correspondingto
the 1st 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 1st 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 byusing the ZY bit.
0
1
128
255
V1[7:0]
256.t
XTAL
PWM1 Signal
t
XTAL
9
Figure 6 :
PWM Timing
STV9422 - STV9424
9/15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STV9422S | 制造商:STMicroelectronics 功能描述: |
| STV9423 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MULTISYNC ON-SCREEN DISPLAY FOR MONITOR |
| STV9424 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MULTISYNC ON-SCREEN DISPLAY FOR MONITOR |
| STV9425 | 功能描述:視頻 IC On-Screen Disp Montr RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| 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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