參數(shù)資料
型號(hào)： BT261KPJ
元件分類： TVS-瞬態(tài)抑制二極管
英文描述： Transient Voltage Suppressor Diodes
中文描述： 視頻信號(hào)發(fā)生器
文件頁(yè)數(shù)： 27/56頁(yè)
文件大小： 387K
代理商： BT261KPJ
Brooktree
21
L261_H
I
NTERNAL
R
EGISTERS
Horizontal Counter
The 12-bit horizontal counter is incremented on the rising edge of CLOCK. It is not accessible by the MPU.
Command Register_0
This command register may be written to or read by the MPU at any time and is not initialized. CR00 corresponds
to D0 and is the least significant bit.
CR07, CR06
Horizontal counter control
(00)
(01)
reserved
reset each noise-gated
CSYNC*
reset to zero upon reach-
ing HCOUNT
use both modes (01) and
(10)
(10)
(11)
A value of (01) forces the horizontal counter to be reset to zero
at the beginning of every noise-gated CSYNC*. These modes
should be selected when using a high–speed oscillator to
divide down and generate the pixel clock.
A value of (10) specifies that the horizontal counter will be
reset to zero upon reaching the HCOUNT value. This mode
should be selected when using the horizontal counter as a sim-
ple divide-by-N circuit (such as when using an external VCO in
a traditional phase-locked loop application). Mode 11 can be
used to correct for missing sync pulses on the input video.
CR05
Capture strobe
This bit is synchronized to VSYNC* and FIELD and output onto
the CAPTURE output pin.
CR04, CR03
Sync detect select
(00)
(01)
(10)
(11)
25 mV
50 mV
100 mV
125 mV
These bits specify how much above the sync tip to slice VIDEO
for sync detection. If inputting TTL sync information, the high-
est slicing level should be selected.
CR02-CR00
Clock input select
(000) TTL compatible OSC1
(001) TTL compatible OSC1*
(010) TTL compatible OSC2
(011) TTL compatible OSC2*
(100) ECL compatible OSC1,
OSC1*
(101) ECL compatible OSC2,
OSC2*
(110) reserved
(111) reserved
These bits specify which OSC input is to be used to generate
pixel clock information. ECL input selection is compatible with
10KH differential ECL driven by a single +5 V supply.
Note
When the clock pin is driven, the selected OSC pin(s)
must also be driven.
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