EL-2800M-USB / EL-2800C-USB
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5.6 Pulse Generator
The EL-2800-USB has a frequency divider using the internal pixel clock as the basic clock and two
pulse generators. In each Pulse Generator, various Clear settings are connected to GPIO. The
following shows Pulse Generator default settings.
Table - 10 Pulse Generator default settings
5.6.1 Clock Pre-scaler
Clock pre-scaler (Divide Value) can set the dividing value of the frequency divider (12-bit
length) and the pixel clock is used for this. Two built-in pulse generators work by the same
clock. In the EL-2800-USB, the internal pixel clock is 54 MHz.
5.6.2 Pulse Generator Selector
This is where you select one of the
2
pulse generators in order to set or modify its parameters.
Table - 11
Pulse Generator setting
Fig.8
Pulse Generator Pulse construction
Pulse generator
length
Pulse generator Start point
Pulse generator End point
Pulse generator repeat count = N
(Pulse generator length x N)
Pulse generator
Clear source IN
(Clear activation
= Rising edge
Clear SYNC mode
= Async)
Pulse generator
Output
Pulse generator
length
Pulse generator
length
0
0
0
Display Name
Value
Clock Pre-scaler
1
Pulse Generator
Selector
Pulse Generator
Length
Start
Point
End
Point
Repeat
Count
Clear
Source
Clear
Inverter
Clear
Activation
Clear
Sync
Mode
-
Pulse Generator 0
1
0
1
0
Off
True
Off
Async Mode
-
Pulse Generator 1
1
0
1
0
Off
True
Off
Async Mode
Note:When Pulse Generator Repeat Count is set to “0”, the camera is operating in Free Running mode.
However, based on the above default settings (Length=1, Start Point=0 and End Point=1), Pulse Generator stops at
High output. Therefore, if Start Point=0 and End Point=1 are configured, Length should be
“
2
”
as the minimum active
width.
Trigger
Selector
item
Description
Pulse Generator 0
If Pulse Generator 0 is selected, Length, Start Point, End Point, Repeat Count, Clear Source
、
Clear
Inverter, Clear Activation and Clear Sync Mode of pulse generator 0 are displayed under the
selector.
Pulse Generator 1
If Pulse Generator 1 is selected, Length, Start Point, End Point, Repeat Count, Clear Source
、
Clear
Inverter, Clear Activation and Clear Sync Mode of pulse generator 1 are displayed under the
selector.