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)： 20/37頁(yè)
文件大?。?/td> 1019K
代理商： TPU2735
TPU 2735
20
7.2. The Page Selection Register, R-PS
The CCU can write a number of a page into R-PS when
this page has been requested before and shall now be
displayed. R-PS has only effect if SIC = 1. (see section
9., “Two Ways to Select a Page for Display”).
R-PS Page Selection Register
address 0/24/16, 2-byte register
D7
D6
D5
D4
D3
D2
D1
D0
tens BCD
units BCD
page number selected for display
TXID
FLOF
OE
D7
D6
D5
D4
D3
D2
D1
D0
magazine number
(binary, 0 0 0 8)
OPN
DPC
*
TXID:
TXID = 1 if a Teletext line was detected in the vertical
flyback interval.
Teletext transmission indicator
OPN:
OPN = 1 makes the TPU receive a requested page
whenever it is transmitted. OPN = 0 makes the TPU re-
ceive a requested page only if NRF = 1, or errors have
been detected (ERF = 1), or C
4
page or update page).
open
= 1 or C
8
= 1 (clear
DPC:
DPC = 1 disables parity checking for the data bytes of all
received TTX rows.
disable parity checking
FLOF:
FLOF = 1 enables reception of rows 24, 27 and 8/30.
enable FLOF mode
OE:
OE = 0 samples the odd data bits off the D2DATA signal,
OE=1 samples the even data bits. This bit is used to se-
lect the TTX Data channel for DMAC VBI TTX Data.
odd/even data sampling
7.3. The Subcode Register, R-SC
The subcode register can be used to make the TPU
2735 respond only to transmitted pages with the sub-
code specified in R-SC. The subcode is normally inter-
preted as a time code.
R-SC Subcode Register
address 0/24/18, 2-byte register
SSC0
SCU3
SCU0
D7
D6
D5
D4
D3
D2
D1
D0
SCT2
SCT1
SCT0
SCU2
SCU1
SCT:
subcode tens (minutes tens)
SCU:
subcode units (minutes units)
SSC2
SCH3
SCH0
D7
D6
D5
D4
D3
D2
D1
D0
SSC1
SCM1 SCM0
SCH2
SCH1
SC:
subcode control
SCM:
subcode thousands (hours tens)
SCH:
subcode hundreds (hours units)
The subcode-control flags SCC 0 to SCC 2 determine
for which sector the subcode is valid.
Subcode Control Flags
subcode valid only for sector 1
subcode valid only for sector 2
subcode valid only for sector 3
subcode valid only for sector 4
subcode valid only for sector 5
subcode valid only for sector 6
subcode valid for all sectors
SSC2
SSC1
SSC0
Function
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
subcode ignored
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