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參數(shù)資料
| 型號： | TPU2735 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Teletext Processor |
| 中文描述： | 圖文處理器 |
| 文件頁數(shù)： | 29/37頁 |
| 文件大小： | 1019K |
| 代理商： | TPU2735 |
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TPU 2735
29
8.5. The Row Flag Register, R-RFx
address x/25/5, 6-byte register
R7
R4
R3
R0
D7
D6
D5
D4
D3
D2
D1
D0
R6
R5
R2
R1
R15
R12
R11
R8
R14
R13
R10
R9
R23
R20
R19
R16
R22
R21
R18
R17
RR7
RR4
RR3
RR0
RR6
RR5
RR2
RR1
RR15
RR12
RR11
RR8
RR14
RR13
RR10
RR9
RR23
RR20
RR19
RR16
RR22
RR21
RR18
RR17
A row flag is set to 1 by the TPU if the corresponding row
has been received. When a new page is received, all row
flags of the corresponding sector are cleared.
The display unit displays only those rows whose row
flags are 1.
The registers x/25/8 to x/25/10 contain the right-hand-
side row flags which are used in NTSC mode. They con-
trol the display of the last 8 character positions of each
row which are transmitted in separate lines.
In PAL/D2MAC mode some of the right-hand side row
flags are used when the FLOF or ECS bits are active:
rowflag RR0: controls display of row x/24. This flag is un-
der software control
rowflag RR4: indicates reception of a row x/27 and is set/
reset by TPU
rowflag RR8: indicates reception of one or more rows
x/26, set/reset by TPU
8.6. The Timing of the Register Chains
The contents of the register chains 1 and 2 is updated
in the TPU only once per field. This is important for a
command sequence with commands which rely on the
execution of preceding commands, e. g. “a clear display”
command followed by new display data. In this example
a pause of 2 fields is necessary before the new data is
written into the RAM: one field for the TPU to recognize
the clear command and another field to execute this
command.
9. Two Ways to Select a Page for Display
First Way
Load the selected page number into R-PS and set SIC
= 1; if the page number has already been requested,
R-DS is loaded automatically with the according sector
number and RPS is set to 1; if RPS remains 0, the CCU
has to load one of the eight R-PR 0 to 7 with this page
number.
Second Way
The CCU compares the selected page number with the
contents of R-PR 0 to 7; if the page number is not found
in R-PR 0 to 7, one register of R-PR 0 to 7 has to be
loaded with the selected page number. The CCU loads
the number of the selected sectors into R-DS.
The R-PS register and SIC control bit are kept for com-
patibility with TPU 2732. For new software the second
way for page selection is recommended.
10. Reset of the TPU 2735 Teletext Processor
The power-up reset makes TTM = 0 (no Teletext mode)
and CR 2 = 1 (clear register chain 2). A software reset
is achieved by setting CR 2 = 1.
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