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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)： | 28/37頁(yè) |
| 文件大?。?/td> | 1019K |
| 代理商： | TPU2735 |
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TPU 2735
28
8. The Control Registers of Register Chain 1
Each RAM sector has its own registers for internal con-
trol purposes. These registers are designated as regis-
ter chain 1 (of sector x) and have the addresses x/25/0
to x/25/10. They are used for control information of the
Teletext transmitter and information about the status of
the data acquisition. In a normal Teletext mode the CCU
does not read or modify these registers. The following
pages define the function of the individual registers. In
a write access, each undefined control bit must be set to
zero to ensure future compatibility.
Register Chain 1 of Sector x
address
bytes
name
x/25/0
2
6
1
1
1
x/25/5
x/25/2
3
4
R–PI
R–RF
R–CB1
R–CB2
R–CB3
page identification
row flags
control bits
8.1. The Page Identification Register, R-PI
address x/25/0, 2-byte register
MSB
LSB
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
tens BCD
units BCD
page number of the received page
MSB
LSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
magazine number
MSB
row number of the page
header (=0)
of the received page
8.2. The Control Bit Register 1, R-CB1
address x/25/2, 1-byte register
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
units BCD
minutes of time code
tens BCD
C
4
C
4
BXT=PAH=1
clear page: C
4
0
→
1 clears row flags and makes
8.3. The Control Bit Register 2, R-CB2
address x/25/3, 1-byte register
C
5
C
6
LSB
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
units BCD
MSB
hours of time code
tens BCD
C
5
: newsflash
C
6
: subtitle
only boxed information is displayed and superimposed
on a TV picture.
8.4. The Control Bit Register 3, R-CB3
address x/25/4, 1-byte register
C
7
C
8
C
9
C
10
C
11
C
12
C
13
D7
D6
D5
D4
D3
D2
D1
D0
C
14
C
14
:
language selection (see R-DC5)
C
13
:
language selection (see R-DC5)
C
12
:
language selection (see R-DC5)
C
11
:
serial magazine mode
C
10
:
inhibit Teletext: inhibits the display of page
C
9
:
out of sequence: this header is not used for the
rolling-header display
C
8
:
C
7
:
The function of C7 is influenced by the “No Header Sup-
pression” (NHS) control bit in register R_DC4 of register
chain 2. Also the “Display Page Header” (PAH) control
bit in register R_DC1 of RC2 overwrites C7. Note that
PAH is set every time the page is updated, and must be
reset to enable the function of C7.
update: C
8
suppress header: this header is not displayed
0
→
1 makes BXT=PAH=1
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