PEDL87V21071-01
OKI Semiconductor
ML87V21071
1.1.7 Stop Memory Write Setting (Freeze Function)
By setting the I2C-bus settings register STL[2:0] (SUB:43h-bit[2:0]), you can stop writing data to the memory.
When you do this, the noise reduction feature stops.
Further, by setting STLM[1:0] (SUB:43h-bit[4:3]), field still image output, frame still image output, or frame still
median) image output can be selected.
The still image data output is achieved by rewriting only the signals read from the memory for the valid data
period selected by the IBLK signal, which indicates the valid data. Therefore, it is necessary to input the input
Sync. signals as normal.
The data output as a field or frame (median) still image is based on the most recent data written to the memory
(before the writing was stopped).
The timing of the writing stop and restoration can be set in one of the following three modes: selected field A/B
timing, field A timing, and field B timing.
In the mode of selected field A/B timing, writing is stopped after data for the next frame (field A + field B) after
writing stop is set is written. Writing is restored from the next frame after writing restoration is set. In this mode,
the field still image output depends on the writing stop setting timing.
In the mode of field A timing, after data for one frame (field B + field A) is written from the field B after writing
stop is set, writing is stopped from the next field B vertical Sync. signal. Writing is restored with the field B
vertical Sync. signal. In this mode, field A is always output for the field still image output.
In the mode of field B timing, after data for one frame (field A + field B) is written from the field A after writing
stop is set, writing is stopped from the next field A vertical Sync. signal. Writing is restored with the field A
vertical Sync. signal. In this mode, field B is always output for the field still image output.
When INPR is set to 1, the setting of field timing STL[2:1] is ignored and only STL[0] stop operation is
performed.
Table F1-1-7(1) Writing Stop Settings
STL
Input data writing
[2]
0
[1]
0
[0]
0
Possible (field A restoration)
Possible (field B restoration)
Possible (either field restoration)
Stopped (field A maintained)
Stopped (field B maintained)
Stopped (either field output maintained)
0
1
0
1
X
0
0
0
1
0
1
1
1
X
1
Table F1-1-7 (2) Still Image Output Mode Settings
STLM
Output still image
[1]
0
[0]
X
0
Field image
Frame image
1
1
1
Frame image (median)
22/123
OKI [ OKI ELECTRONIC COMPONETS ]
