STV9410 datasheet(20/25 Pages) STMICROELECTRONICS

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5. CHARACTER CODE FORMAT

Each character is defined with a two bytes code;

the first is at an even address, the second is at the

following odd address. Some attributes are paral-

lel, other keep the last explicit value.

STV9410 uses 3 different types of codes.

5.1 ALPHANUMERIC CHARACTERS

(256 patterns)

The background color is not defined by the code; it

takes the same value as the previous character or

it has the value of the margin color at the beginning

of each row.

The character pattern lies in ROM if CHARACTER

NUMBER is lower than 80h, (ALPHANUMERIC

CHARACTER SET is shown in TABLE 3),else it is

User Defined Character in RAM (DRCS).

ODD

CHARACTER NUMBER

EVEN

FC2 FC1 FC0

CHARACTER

NUMBER

ROM or RAM character set code

Inverted video if set.

Double character width if set, code must

be repeated for the right part of the

character.

Double character height if set, code

must be repeated for the bottom part of

the character. The first DH attribute

encountered in a vertical column is

always interpreted as a top part.

Flashing, inverted phase if IV is set.

FC(2:0)

Foreground color (Green, Red, Blue).

5.2. GRAPHIC CHARACTERS (224 patterns)

IV, DW, DH, UL take the value ”0”

CHARACTER NUMBER must be lower than E0h.

The character pattern lies in ROM if CHARACTER

NUMBER is lower than 80h, (STANDARD MOSAIC

character set is shown in Table 4), else it is an User

Defined Character in RAM (DRCS).

ODD

CHARACTER NUMBER

EVEN

BC2 BC1 BC0

FC2 FC1 FC0

CHARACTER

NUMBER

ROM or RAM character set code

BC(2:0)

Background color (Green, Red, Blue).

Flashing.

FC(2:0)

Foreground color (Green, Red, Blue).

5.3. CONTROL CHARACTERS (32 codes)

These characters are displayed as foreground

color spaces if HG bit is clear. They can change

some attributes applying to themselves and to the

following string.

ODD

EOL

EVEN

BC2 BC1 BC0

FC2 FC1 FC0

EOL

: End Of Line

0 normal control code

1 space are displayed until the end of the row,

allowing memory space saving

IF,IB

: Insert foreground, Insert background attribute.

0 fast blanking disable

1 fast blanking enable

: Underlined

0 disable

1 enable

: Conceal Character

0 disable

1 enable, character is diplayed as a space.

BC(2:0) : Default background color of next character(s)

: Hold Graphics

0 disable, the control character is displayed as

a uniform space character with foreground

color fixed by FC(2:0)

1 enable, the control character pattern takes

the last mosaic value encountered in the row,

if any, or is a space.

FC(2:0) : G, R, B foreground value of the control

character

At the beginning of each row, those attributes take

default values :

- EOL, UL, CC, HG = 0

-IF = 1

- IB = IMG (Margin insert attribute)

- BC(2:0) = GMG, RMG, BMG (Margin color).

Notice that following characters code is reserved

for futur use.

ODD

1111

XXX1

EVEN

XXXXX

6. CHARACTER GENERATORS

Each pixel is defined with one bit, 1 refers to

foreground color, and 0 to background color.

PX7

PX6

PX5

PX4

PX3

PX2

PX1

PX0

PX7 is the leftmost pixel.

Character slice address :

Each character generator contains a succession of

patterns arranged as a number of horizontal slices :

- Slice addr = (Set addr) + Char Number x 10 +

(slice number)

- Char Number is the number of the character in

the set; using DRCS in RAM, the calling code of

the character is the number of the character in

the set plus 80h.

- Set addr is defined in ADDR register, in RAM for

DRCS (see section 3.2), and is 2000h for ALPHA-

NUMERIC ROM, and 2800h for STANDARD

MOSAIC ROM.

STV9410

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