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PDF M66332FP Data sheet ( Hoja de datos )
| Número de pieza | M66332FP | |
| Descripción | FACSIMILE IMAGE DATA PROCESSOR | |
| Fabricantes | Mitsubishi | |
| Logotipo |  |
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MITMSITUSBUISBHISI H〈DI I〈GDIITGAITLAALSASSPS〉 P〉
M663M36623F32PFP
FACFASCIMSIILMEILIMEAIMGAEGDEATDAATPARPORCOECSSEOSSROR
DESCRIPTION
The M66332 is a facsimile image processing controller that
converts analog signals that are photoelectrically converted
by an image sensor into bi-level signals.
It has image processing functions such as peak detection,
uniformity correction, γ correction, MTF compensation, de-
tector of background and object levels, dither control, sepa-
ration of image data area, scale down, and area specification.
This controller has a built-in 5-bit flash type A-D converter
and interface circuits to image sensor, analog signal process-
ing circuit, and CODEC (Coder & Decoder) to simplify control
of the readout mechanism.
FEATURES
0 High Speed Scan (MAX. 2 ms/line, TYP. 5 ms/line)
0 A3 (8 pixels/mm) Line Sensor Attachment
0 Image sensor (CCD,CIS) control signal generation
CCD: SH, CK1, CK2, RS
Contact sensor (CIS): SH, CK1 (or CK2)
0 Analog signal processing circuit control signal generation
CLAMP, S/H, AGC, DSCH
0 Built-in 5-bit Flash Type A-D Converter
0Bi-level data external input/output interface Serial output
(→M66330)
8-bit MPU bus output with external DMA control signal
0 Image data processing
γ correction
Uniformity correction (block correction in units of 8 pixels)
MTF compensation (1 dimension)
Detector of background and object level (programmable)
Dithering control
• Dither method (16 levels using 4 × 4 matrix)
Separation of image data area (1 dimension)
Scale down A3 → B4, A3 → A4, B4 → A4
0 5V Single Power Supply
APPLICATION
Facsimiles
PIN CONFIGURATION (TOP VIEW)
GND
VCC
CS
MPU Interface
RD
WR
RESET
GND
GND
DMA Interface
DRQ
DAK
VCC
Sensor Interface SH
45
46
47
48
49
50
51
52
53
54
55
56
M66332FP
28 TEST Test pin
27 ASIG Analog Signal
26 NC Processing Interface
25 VWL White Basic Supply Voltage
24 VML3 Middle Basic Supply Voltage 3
23 VML2 Middle Basic Supply Voltage 2
22 GND
21 VML1 Middle Basic Supply Voltage 1
20 VBL Black Basic Supply Voltage
19 AGND
18 AVCC
17 DSCH Analog Signal
Processing Interface
Outline 56P6N-A
NC: No Connection
1
1 page  
MITSUBISHI 〈DIGITAL ASSP〉
M66332FP
FACSIMILE IMAGE DATA PROCESSOR
(1) Operating mode
The M66332 performs three basic operations.
• Peak value detection: The peak value of the analog signal
output from the analog signal processing circuits is
matched to the white reference voltage (VWL) of the
M66332 internal A-D converter. (See also Figs. 19 to 22 in
the M66333FP document.)
• Uniformity correction data creation: White reference data is
created for sensor unit uniformity correction and written to
the correction memory (SRAM: 304 words × 5bits).
• Read operation: A document is read and the image is pro-
cessed to output bi-level data as serial or parallel output.
These three basic operations are performed in the following
sequence depending on whether the sensor is CCD or CIS.
The sensor is selected with register 0 (SENS).
When the sensor is CCD:
UNIF mode
v
SCAN mode
Operation is started by setting the
UNIF command in register 0 to “H”.
If the sensor is CCD, peak detection
(16 line periods) and white unifor-
mity correction data creation (8 line
periods) are performed consecu-
tively.
To exit this operating mode, wait 30
line periods (at least 24 lines) from
the start and set the UNIF command
to “L”.
The read operation is started by set-
ting the SCAN command in register
0 to “H”.
Set the SCAN command to “L” to exit
this operation mode.
When the sensor is CIS:
(Creation and transmission of uniformity correction data)
UNIF mode
v
Data transfer
This mode is started when the UNIF
command in register 0 is set to “H”.
When the sensor is CIS, if white cor-
rection is started with the UNIF com-
mand, peak detection (16 line
periods) and uniformity white correc-
tion data creation (8 line period) are
started.
To exit this operating mode, wait 30
line periods (at least 24 line periods)
from the start and set the UNIF com-
mand to “L”.
The uniformity correction data per-
taining to white correction created in
UNIF mode are transferred to the
backup memory.
(Read operation)
AGC mode
v
SCAN mode
Peak detection is performed for 16
line periods when the AGC com-
mand in register 0 is set to “H”.
To exit this operating mode, wait 20
line periods (at least 16 lines) from
the start and set the AGC command
to “L”.
The read operation is started by set-
ting the SCAN command in register
0 to “H”.
Set the SCAN command to “L” to exit
this operating mode.
The signal functions and data flow in each mode are shown
on pages 4–123 and 4–124. Flowcharts are shown on pages
4-158 to 4–160.
5
5 Page 
• Uniformity correction
Uniformity correction corrects the drop in lighting level at
both ends of the light source, shading distortion due to drop
in lighting level at the rim of the lens, and high frequency dis-
tortion caused by the scattering of pixel-unit image sensor
characteristic (see Fig. 5).
The M66332 creates uniformity correction data in UNIF
mode, one of the three operating modes (AGC, UNIF, SCAN),
handling 8 pixels as a unit as shown in Fig. 6. The created
data is written to the internal correction memory (SRAM: 304
words × 5 bits).
In SCAN mode, the correction data is read from the internal
correction memory to successively correct the input image
data in pixel units.
MITSUBISHI 〈DIGITAL ASSP〉
M66332FP
FACSIMILE IMAGE DATA PROCESSOR
Black level
High frequency
distortion
Shading distortion
White level
1 line
Fig. 5 Image sensor white data output waveform
Primary scanning direction
1 89
16 17
Pixels
24
Correction data 1
Correction data 2
Correction data 3
For pixels from 1 to 8, uniformity correction is carried out by correction data 1.
For pixels from 9 to 16, uniformity correction is carried out by correction data 2.
For pixels from 17 to 24, uniformity correction is carried out by correction data 3.
Fig. 6 Creation of uniformity correction data
11
11 Page | ||
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| PDF Descargar | [ Datasheet M66332FP.PDF ] | |
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