5
MITSUBISHI
DIGITAL ASSP
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
For the CCD sensor
AGC mode
The peak value of the 16 line cycle is de-
tected by setting the AGC command in
the register 00 at “H”.
To escape this mode, set the AGC com-
mand at “L” after a 20 line cycle (or a cycle
of 16 lines or more) passed since the
start.
This operation mode is started by setting
the UNIF command in the register 00 at
“H” after setting UMODE: “H” (white cor-
rection) in the register 00 and UNIFM: “L”
(only white correction) in the register 01.
Starting by the UNIF command also
makes the system generate data for non-
uniformity correction for white correction
(for the 8 line cycle).
To escape this mode, set the UNIF com-
mand at “L” after a 10 line cycle (or a cycle
of 8 lines or more) passed since the start.
The read operation mode is started by
setting the SCAN command in the regis-
ter 00 at “H”. To escape this mode, set
the SCAN command at “L”.
UNIF mode (white)
SCAN mode
(1) Operation mode
The M66335 has three basic operations.
Peak value detection: Adjusting the peak value of analog signals
output from the analog circuit to the white reference voltage (VWL)
of the A/D converter built in the M66335.
Generation of data for uniformity correction: Generating data on
a white reference original sheet for uniformity correction by the
sensor unit and writing them to the memory for correction built
in the M66335.
Read: Reading original sheets, performing image processing of
the read image data, and outputting in serial or parallel the indi-
cated converted binary data.
The M66335 is capable of performing the DMA transfer of
multivalued data (6-bit data=D7~D2, D1=D0=0) after correction
about uniformities.
These three basic operations are performed in the following mode
sequences for the CCD sensor and CIS sensor. The sensor is set
through the register 00 (SENS).
For the CIS sensor
AGC mode
The peak value of the 16 line cycle is
detected by setting the AGC command
in the register 00 at “H”.
To escape this mode, set the AGC com-
mand at “L” after a 20 line cycle (or a cycle
of 16 lines or more) passed since the
start.
When this operation mode is started by
the UNIF command after setting UMODE:
“L” (black correction) in the register 00
and UNIFM: “H” (black and white correc-
tion) in the register 01, the system also
generates black data for non-uniformity
correction for black correction (for the 8
line cycle).
To escape this mode, set the UNIF com-
mand at “L” after a 10 line cycle (or a cycle
of 8 lines or more) passed since the start.
In the case of only white correction, the
setting is not necessary. Follow the
instruction below.
When this operation mode is started by
the UNIF command in the register 00 af-
ter setting UMODE: “H” (white correction)
in the register 00 and UNIFM: “L” (only
white correction) in the register 01, the
system also generates white data for non-
uniformity correction for white correction
(for the 8 line cycle).
To escape this mode, set the UNIF com-
mand at “L” after a 10 line cycle (or a cycle
of 8 lines or more) passed since the start.
The reading operation is started by set-
ting the SCAN command in the register
00 at “H”. To escape this mode, set the
SCAN mode at “L”.
The signal operations and data flow
in each basic operation are shown in
the page 4-217 and 4-218, and the flow-
chart is in the page 4-260 and 4-261.
UNIF mode (black)
UNIF mode (white)
SCAN mode