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MT9M131 Scheda tecnica(PDF) 31 Page - ON Semiconductor

Il numero della parte MT9M131
Spiegazioni elettronici  1/3?릋nch SOC 1.3Mp CMOS Digital Image Sensor
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31
SENSOR CORE REGISTERS
Sensor registers are generally updated before the next FV
is asserted. See the column titled “Synced to Frame Start” in
Table 13 for per-register information.
Notation Used in the Sensor Core Register
Description Table
Sync’d to Frame Start
0 = Not applicable, for example, read-only register
N = No. The register value is updated and used
immediately
Y = Yes. The register value is updated at next frame
start as long as the synchronize changes bit is “0”.
Frame start is defined as when the first dark row is read
out. By default, this is 8 rows before FV goes HIGH
Bad Frame
A bad frame is a frame where all rows do not have the
same integration time, or offsets to the pixel values changed
during the frame.
0 = Not applicable, for example, read-only register
N = No. Changing the register value does not produce
a bad frame
Y = Yes. Changing the register value might produce
a bad frame
YM = Yes, but the bad frame is masked out unless the
“show bad frames” feature is enabled
Read/Write
R = Read-only register/bit
W = Read/write register/bit
Table 13. SENSOR CORE REGISTER DESCRIPTIONS
Bit Field
Description
Default
(Hex)
Synced to
Frame Start
Bad
Frame
Read/Write
R0:0 − 0x000 − Chip Version (R/O)
Bits 15:0
Hardwired read-only
0x143A
R
R1:0 − 0x001 − Row Start
Bits 10:0
Row Start
The first row to be read out (not counting dark rows
that may be read). To window the image down, set
this register to the starting Y value. Setting a value
less than 8 is not recommended since the dark rows
should be read using R0x022.
0xC
Y
YM
W
R2:0 − 0x002 − Column Start
Bits 10:0
Col Start
The first column to be read out (not counting dark
columns that may be read). To window the image
down, set this register to the starting X value. Setting
a value below 0x18 is not recommended since
readout of dark columns should be controlled by
R0x022.
0x1E
Y
YM
W
R3:0 − 0x003 − Window Height
Bits 10:0
Window Height
Number of rows in the image to be read out (not
counting dark rows or border rows that may be read).
0x400
Y
YM
W
R4:0 − 0x004 − Window Width
Bits 10:0
Window Width
Number of columns in image to be read out (not
counting dark columns or border columns that may
be read).
0x500
Y
YM
W
R5:0 − 0x005 − Horizontal Blanking − Context B
Bits 10:0
Horizontal
Blanking B
Number of blank columns in a row when context B
is chosen (R0x0C8[0] = 1). If set smaller than the
minimum value, the minimum value is used. With
default settings, the minimum horizontal blanking is
202 columns in full-power readout mode and
114 columns in low-power readout mode.
0x184
Y
YM
W
R6:0 − 0x006 − Vertical Blanking − Context B
Bits 14:0
Vertical Blanking B
Number of blank rows in a frame when context B is
chosen (R0x0C8[1] = 1). This number must be equal
to or larger than the number of dark rows read out in
a frame specified by R0x022.
0x2A
Y
N
W


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