參數(shù)資料
型號(hào)： MC44007
廠商： Motorola, Inc.
英文描述： CHROMA 4 VIDEO PROCESSOR
中文描述： 色度4視頻處理器
文件頁(yè)數(shù)： 30/40頁(yè)
文件大小： 491K
代理商： MC44007
MC44002 MC44007
SOFTWARE CONTROL FUNCTIONS
30
MOTOROLA ANALOG IC DEVICE DATA
General Description
As already related in the circuit description, the
MC44002/7 has a memory of 18 bytes. All, except
Sub-address 77 and 7F, use the 6 least significant bits as an
analog control register with D/A converters (64 steps) within
the memory section. The remaining bits are controlled
individually for switching numerous functions. Table 2 gives a
listing of all the memory registers and control bits. An
explanation of the function of the 16 DACs is given below.
Vertical Amplitude
– Changes the amplitude of the
vertical ramp available on Pin 7.
Vertical Breathing Correction
–
A correction is applied to
the vertical ramp amplitude in a sense opposite to the picture
expansion and contraction produced by changes in beam
current. This register alters the sensitivity of the beam current
sensing and hence the size of correction applied for a given
change in beam current.
Parabola Amplitude
–
Changes the amplitude of the E-W
output parabola developed across an external pull-up
resistor at Pin 8.
Parabola Tilt
– Shifts the point of inflection of the E-W
parabola from side to side along the time axis. Also known as
keystone correction
Vertical Linearity
– The vertical ramp is multiplied by itself
to give a squared term, a part of which is either added or
subtracted to the linear ramp as determined by this register.
Corner Correction
–
An independent 4th order term
which is subtracted from the E-W parabola to achieve correct
geometry with flat square tubes.
Horizontal Amplitude
–
A variable dc offset applied to the
E-W output parabola on Pin 8.
Vertical Position
– Adjust the dc level of the vertical ramp
on Pin 7, allowing vertical centering control.
Horizontal Phase Control
– Applies a variable phase
offset to the horizontal drive pulse at Pin 15 providing for a
picture centering control.
B, G, R Intensity
– These controls set up the current
reference pulses used when sampling the beam current
during field interval. The data is fixed by the TV manufacturer
when setting up the White balance and the CRT for correct
Gray Scale tracking.
(All the above registers are for use during the test and
setting up procedures; the remaining 4 registers are also
user controls.)
Contrast
–
During bright sample time during the field
interval, this control varies the level of the current pulses
injected into the R,G,B channels, so altering the picture
contrast.
Brightness
–
A variable current pedestal which is added
to the three drives during active picture time.
Saturation
– A variable gain control for the two color
difference signals.
Hue
– Achieved by mixing a portion of one color difference
signal into the other.
Individually Adjustable Control Bits
– These consist of
bits 7 and 6 of registers 77 through 88, as well as bits 0 to 5
of register 77 and bits 0 to 3 of register 7F. Some of these are
used individually to control single functions requiring just
on/off switching; and some are arranged into 2 or 3-bit words
(e.g., luma peaking). A list of control words and truth tables
for these may be found in Table 3.
CA1, CB1
–
Used to change the mode of operation of the
vertical timebase to either injection lock or auto countdown,
or to force it into 525 or 625 lines. Just prior to changing
channel, the vertical timebase can be switched to injection
lock mode and when a new channel is captured, the
timebase is switched back to auto mode. In this way there is
no delay in locking onto the new channel and hence no
picture roll. If there is no valid signal being received, the
display can be stabilized by forcing the timebase into 525 or
625 lines.
IC1, IF1
–
These bits are used to suppress the field
interlace, which can be scanned in the nearest even or odd
half line.
HI, VI
–
Selects the type of SECAM ident when operating
in this mode. Either vertical ident bursts or horizontal ident
can be selected individually, or ident can be taken from a
combination of the two. In certain transmissions the vertical
SECAM identification is not present (and sometimes
replaced by other signals), so it is strongly recommended
that only the horizontal identification be used. These bits
must both be set to 1 when SECAM is not decoded
(MC44002 and MC44007).
SSA, SSB, SSC
–
Used to set the color decoder and the
dc level of the System Select output from the MC44002/7,
Pin 30. This output is used by the MC44140 delay line in turn
for changing between PAL, NTSC, SECAM and external
modes of operation. In effect, the MC44140 is being
controlled by the I2C bus via the MC44002/7.
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