ST63140 datasheet(49/86 Pages) STMICROELECTRONICS

49 / 86 page

The ST631xx OSD macrocell is a CMOS LSI char-

acter generator which enable display of characters

and symbols on the TV screen. The character

rounding function enhances the readability of the

characters. The ST631xx OSD receives horizontal

and vertical synchronization signal and outputs

screen information via R, G, B and blanking pins.

The main characteristics of the macrocell are listed

below:

- Number of display characters: 5 lines by 15

columns.

- Number of character types: 128 characters in

two banks of 64 characters. Only one bank

per screen can be used.

- Character size: Four character heights (18h,

36h 54h, 72h), two heights are available per

screen, programmable by line.

- Character format: 6x9 dots with character

rounding function.

- Character colour: Eight colours available pro-

grammable by word.

- Display position: 64 horizontal positions by

2/fosc and 63 vertical positions by 4 h

- Word spacing: 64 positions programmable

from 2/fosc to 128/fosc.

- Line spacing: 63 positions programmable from

4 to 252 h.

- Background: No background, square back-

ground or fringe background programmable by

word.

- Background colour: Two of eight colours avail-

able programmable by word.

- Display output: Three character data output

terminals (R,G,B) and a blank output terminal.

- Display on/off: Display data may be pro-

grammed on or off by word or entire screen.

The entire screen may be blanked.

Format Specification

The entire display can be turned on or off through

the use of the global enable bit or the display may

be selectively turned on or off by word. To turn off

the entire display, the global enable bit (GE) should

be zero. If the global enable is one, the display is

controlled by the word enable bits (WE). Theglobal

enable bit is located in the global enable register

and the word enable bit is located in the space

character preceding the word.

Each line must begin with a format character which

describes the format of that line and of the first

word. This character is not displayed.

A space character defines the format of sub-

sequent words. A space character is denoted by a

one in bit 6 in the display RAM. If bit 6 of the display

RAM is a zero, the other six bits define one of the

64 display characters.

The colour, background and enable can be pro-

grammed by word. This information is encoded in

the space character between words or in the for-

mat character at the beginning of each line. Five

bits define the colour and background of the follow-

ing word, and determine whether it will be dis-

played or not.

Characters are stored in a 6 x 9 dot format. One dot

is defined vertically as 2h (horizontal lines) and

horizontally as 2/fosc if the smallest character size

is enabled. There is no space between characters

or lines if the vertical space enable (VSE) and hori-

zontal space enable (HSE) bits are both zero. This

allows the use of special graphics characters.

The normal alphanumeric character set is format-

ted to be 5 x 7 with one empty row at the top and

one at the bottom and one empty column at the

right. If VSE and HSE are both zero, then the spac-

ing between alphanumeric characters is 1 dot and

the spacing between lines ofalphanumeric charac-

ters is 2h.

The character size is programmed by line through

the use of the size bit (S) in the format character

and the global size bits (GS1 and GS2). The verti-

cal spacing enable bit (VSE) located in the format

character controls the spacing between lines. If

this bit is set to one, the spacing between lines is

defined by the vertical spacing register, otherwise

the spacing between lines is 0.

The spacing between words is controlled by the

horizontal space enable bit (HSE) located in the

space character. If this bit is set to one, the spacing

between words is defined by the horizontal spacing

dots is the spacing between words.

The formats for the display character, space

character and format character are described

hereafter.

ON-SCREEN DISPLAY (OSD)

ST63140,142,126,156

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