STV5342 STMICROELECTRONICS [STMicroelectronics], STV5342 Datasheet - Page 15

• Manufacturer Part Number: STV5342
• Description: TELETEXT DECODER WITH 4 INTERGATED PAGES
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

REGISTER FUNCTIONS
* Reading of R11A or R11B is determined by register 0, bit D0. Nevertheless, write operation is always performed on R11A register.
Table 3 : Register R3
CHARACTER SETS
The complete character set with 8-bit decoding is
given in Table 4.
Characters in columns 0 and 1 are normally dis-
played as blanks. Black dots represent the charac-
ter shape whereas white dots represent the
background.
Each character can be identified by a pair of corre-
09H to 0BH*
R9 to R11A
The abbreviations have the same significance as in Table 1 with the exception of the ”DO CARE” entries. It is only
when this bit is ”1” that the corresponding digit is taken into consideration on page request. For example, a page
defined as ”normal” or one defined as ”timed” may be selected.
If ”HOLD” is low the page is held. The addressing of successive bytes via the I
Register
Address
Address
COLUMN
R11B
0BH*
START
0
1
2
3
4
5
6
Active row address (R9), active column address (R10).
Data contained in R11A read (written) from (to) memory by microprocessor via I
Function
Do care magazine
Do care page tens
Do care page units
Do care hours tens
Do care hours units
Do care minutes tens
Do care minutes units
Status
PRD4
Quality (D0)
VCS Signal
60Hz (D7)
Bit(s)
Good VCS quality signal detected (D0 = 1) or disturbed (D0 = 0)
VCS received with 60Hz frequency (D7 = 1) or 50Hz (D7 = 0).
Only valid when VCS is good (D0 = 1)
HOLD
PRD3
MU3
PU3
HU3
PT3
X
X
sponding row and column integers : for example
the character ”3” may be indicated by 3/3.
A rectangle may be represented as follows :
The characters 8/6, 8/7, 9/5, 9/7 are used as spe-
cial characters, always in conjunction with 8/5.
The 13 national characters are placed in columns
with bit 8 = 0.
MAG2
PRD2
MU2
PU2
HU2
MT2
PT2
X
Description
2
C bus is automatic.
MAG1
PRD1
MU1
PU1
HT1
HU1
MT1
PT1
2
C.
MAG0
PRD0
MU0
PU0
HT0
HU0
MT0
PT0
STV5342
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