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参数资料
| 型号： | MC144144P |
| 厂商： | MOTOROLA INC |
| 元件分类： | 颜色信号转换 |
| 英文描述： | Digital Signal Processors 44-JLCC -55 to 125 |
| 中文描述： | COLOR SIGNAL DECODER, PDIP18 |
| 封装： | PLASTIC, DIP-18 |
| 文件页数： | 23/44页 |
| 文件大小： | 565K |
| 代理商： | MC144144P |
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MC144144
23
MOTOROLA
Interrupt Mask Register
—
Address = 07h
D7
D6
D5
D4
D3
D2
D1
D0
dTXT
dCAP
dXDS
dSCH
dLOK
EOF
DLE
DAV
This register identifies which activities in the interrupt re-
quest register will be used to cause an interrupt. Setting a bit
to a one enables the interrupt when the corresponding event
becomes active. Setting all bits of this register to zero dis-
ables interrupts.
Caption Activity Register — Address = 08h
D7
D6
D5
D4
D3
D2
D1
D0
T4
T3
T2
T1
CC4
CC3
CC2
CC1
Activity Bits, CC1–T4 —
Each bit will be set HIGH when a
mode setting command for its data channel has been re-
ceived. The bit will be cleared to the LOW state if no activity
is detected in that data channel during the next 12 – 16 s or if
there is a loss of lock.
XDS DATA RECOVERY
The MC144144 is able to recover extended data services
(XDS) information from the input video signal. This data, for-
matted according to the Electronics Industries Association
(EIA) recommended practice, EIA–608, can contain a wide
variety of information about current and future programs, the
channel currently tuned, other channels and miscellaneous
data including time of day.
XDS data is only present in the even field. The MC144144
can recover XDS data even while performing its normal cap-
tion decoder or OSD functions.
XDS data packets are tagged according to a class/type
system defined by EIA–608. The data may be filtered to ex-
tract only the classes of interest to the application. An addi-
tional level of filtering is provided that permits selection of
certain groups of packets that are of use in specific appli-
cations. XDS filtering reduces the traffic on the serial bus,
reduces the load of the TV/VCR control processor, and sim-
plifies external XDS decoding.
XDS data recovery is enabled by selecting one or more
classes in the XDS filter register. Optionally, a secondary fil-
ter code can be specified which further limits the packets to
be recovered. Once XDS recovery is enabled filtered data
pairs will be loaded into the serial output registers of the
MC144144 immediately upon receipt. The DAV and RD2 bits
of the serial status (SS) register will then go high, indicating
the availability of two output bytes. The external TV control
processor does not need to send a READ SELECT com-
mand in order to read these data bytes.
When the XDS filter register is set to zero (the default
state) XDS recovery is disabled.
When XDS data recovery is enabled, the external control-
ler should avoid performing any other read operation, except
SS reads, in the beginning of field 2. This is most easily ac-
complished by using the end of field (EOF) or data line end
(DLE) interrupt to locate the end of field 2 or the vertical
blanking interval (VBI) of field 1, and then perform the READ
SELECT and READ functions during this portion of the video
frame. Commands other than READ SELECTS will not inter-
fere with XDS data recovery regardless of their position in
the video frame.
Some examples of WRITE commands that could be used
to set the XDS FILTER register are shown below. The XDS
Filter register bit assignments are defined in the
Internal
Registers
section.
{C5,1F}
All XDS packets recovered.
{C5,01}
All current class packets recovered.
{C5,41}
All In band, current class packets recovered.
{C5,62}
All out of band, future class packets
recovered.
{C5,28}
Time information only recovered. Will extract
the time of day (TOD) and local time zone
(LTZ) packets from the miscellaneous class
data.
{C5,9F}
VCR Information recovered. Will select TOD,
LTZ, net ID, local call letters, impulse capture,
tape delay, composite 2, and out of band
channel number packets for recovery.
ON–SCREEN DISPLAY
OSD Operation
The user can supply information for display in an OSD
fashion through the serial port. In addition to all the normal
and extended features of the VBI data display modes, OSD
mode also has available added graphics characters, double
high and double wide characters, and the ability to position
the display anywhere on the screen with an adjustable (verti-
cal) box size. The OSD display mode can use either 13 or
15 lines per row, with box or drop shadow. The default is
15 scan lines per row and drop shadow. Enhanced attributes
are always enabled.
The 15 scan line per row display can only show 13 rows
on–screen when in the NTSC mode. Rows 14 and 15 will be
off–screen and should not be addressed. In the PAL mode all
rows will be visible.
The 15 scan lines per row mode display can show the full
graphic characters and accented capital letters and des-
cenders without the potential overlap that would result from
the 13 scan line per row display. If the OSD display mode is
changed to a 13 scan line per row mode, the top two scan
lines of any graphics or accented capital letter will be “ored”
together with the bottom two scan lines from the row above.
In 13 line – drop shadow mode this will also result in a side
shadow effect. Graphics characters should not be used in
the 13 line – drop shadow mode.
The OSD character set is shown in Figures 8 and 9. There
are 256 possible addresses and Figure 8 shows the address
map in the range 00h – BFh. This portion of the addressable
space contains the control bytes and regular character set.
Figure 9 shows the address map in the range C0h – FFh.
These addresses are shared by the extended character set
and the graphics character set. Any particular OSD screen
can use one or the other of these sets of characters but not
both.
The character set in force is controlled by the type of dis-
play mode being invoked. When drop shadow is being used,
by default, the graphics character set will be displayed in re-
sponse to an address in the C0h – FFh range. However, if a
BOX display is used, the extended character set is invoked.
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