參數(shù)資料
型號(hào)： TPU2735
廠商： Electronic Theatre Controls, Inc.
英文描述： Teletext Processor
中文描述： 圖文處理器
文件頁(yè)數(shù)： 23/37頁(yè)
文件大?。?/td> 1019K
代理商： TPU2735
TPU 2735
23
7.7. The Display Control Registers, R-DC1 to
R-DC6
The flags of R-DC1 determine the way the control infor-
mation (page header, status indicator, time, menu) is
displayed. The flags of R-DC2 and R-DC4 determine the
way the Teletext page is displayed. The flags of R-DC5
determine which character set is used.
R-DC1 Display Control Register 1
address 0/24/24, 1-byte register
TOE
BXT
PAH
HLT
D7
D6
D5
D4
D3
D2
D1
D0
MEN
TOF
IND
*
*
*
*
*
TIM
TOE:
TOE = 1 enables the automatic reset of BXT, PAH, IND
and TIM after 5 s for PAL or 4 s for NTSC.
timeout enable
MEN:
MEN = 0 means normal display, and MEN = 1 means
that the menu is displayed.
display menu
TOF:
TV picture is displayed (BL = 0)
text off
BXT:
display boxes (with time-out option) in a
TV picture
PAH:
If PAH is set to 1 by the CCU, a 5 second timer is started.
During these 5 sec the row 0 of the selected sector is dis-
played. Thereafter, PAH is reset to 0. Time-out can be
switched off by TOE = 0. If PAH, TOF and TTM are 1, the
row 0 of the selected sector is boxed in the normal TV
picture.
display page header
IND:
similar to PAH, but the first eight characters of row 0 of
the selected sector are displayed.
display indicator (with time-out option)
TIM:
similar to PAH, but the last eight characters of row 0 of
the selected sector are displayed in white.
display time (with time-out option)
HLT:
If HLT = 1 the last eight characters of the displayed page
header are replaced by a symbol which indicates that
the page is not updated. TIM has priority over HLT.
indicate halt mode
PAH and BXT are influenced by the data acquisition con-
trol according to the following table:
Requested Page
of Sector N is received
Sector N is
selected for display
Subtitle Page
Clear Page
Update Page
NRFx
Set PAH
and BXT
0
1
1
1
1
1
x
0
1
1
1
1
x
x
x
0
0
1
x
x
x
1
x
x
x
x
x
x
1
x
x
x
1
x
x
0
0
0
1
1
1
0
x = don’t care
Display Behaviour of Updated Pages
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