FUNCTIONAL DESCRIPTION (continued)

IV - I

IV.1 - Registers Functions (continued)

Register

Function

Bit(s)

Description

R7

Address

07H

Display mode

BOX ON 0, 1-23,24

(D0, D1, D2)

The “boxing” function is enabled on row 0,1-23 and 24 by

D0, D1 and D2 set to one.

TOP / BOTTOM

Single / Double Height

(D4/D3)

X0 = Normal

01 = double height Rows 0 to 11

11 = double height Rows 12 to 23

Conceal / Reveal (D5) Conceal Reveal Function

Cursor ON/OFF (D6)

Cursor position given by row/column value of R9/R10

STATUS ROW

BTM / TOP (D7)

The row 24 is displayed before the “Main text Area” (lines

0-23) or after (D7 = 0).

R8

Memory access

VPS Enable (D4)

D4 = 1 Enable VPS acquisition and DV signal output.

Clear Memory (D3)

D4 = 1 Clear memory.

Chapter selected with A2A1A0 (D2, D1, D0) R4.

Chapter Address

(D2, D1, D0)

Chapter selection

R9 to R11A

Address

08H to 0BH*

Active row address (R9), active column address (R10).

Data contained in R11A read (written) from (to) memory by microprocessor via I

R11B

Address

0BH*

Status

VCS QUAL (D0)

Good VCS quality signal detected (D0 = 1).

Bad VCS quality signal detected (D0 = 0).

DATA QUAL (D1)

Good TELETEXT signal (D1 = 1).

Bad TELETEXT signal (D1 = 0).

50/60Hz (D7)

If D1 = 0 frame frequency is 50Hz (only valid with good

VCS)

* Reading of R11A or R11B is de termined by register 0, bit D0. However, write operation is a lways performed on R11A register.

START

COLUMN

PRD4

PRD3

PRD2

PRD1

PRD0

0

Do care magazine

HOLD

MAG2

MAG1

MAG0

1

Do care page tens

PT3

PT2

PT1

PT0

2

Do care page units

PU3

PU2

PU1

PU0

3

Do care hours tens

X

X

HT1

HT0

4

Do care hours units

HU3

HU2

HU1

HU0

5

Do care minutes tens

X

MT2

MT1

MT0

6

Do care minutes units

MU3

MU2

MU1

MU0

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

Table 4 : Register R3

V - Character Sets

The complete character set with 8-bit decoding is

given in Table 5.

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-

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.

STV5347 - STV5347/H - STV5347/T

11/22