ST6380 datasheet(50/82 Pages) STMICROELECTRONICS

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ST6380, ST6381, ST6382, ST6383, ST6388, ST6389

ON-SCREEN DISPLAY (Cont’d)

The character size is programmed by line through

the use of the size bits (S1 and S2) in the format

character. The vertical spacing enable bit (VSE)

located in the format character controls the spac-

ing between lines. If this bit is set to one, the spac-

ing between lines is defined by one of the vertical

spacing register, otherwise the spacing between

lines is 0. As there are two vertical space registers

available, the actual spacing between two succes-

sive lines will be selected by the vertical space se-

lect bit (VSS) in the format character.

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 spac-

ing between words is defined by the horizontal

spacing register, otherwise the space character

width of 14 dots is the spacing between words.

The formats for the format character, display char-

acter and space character are described hereaf-

ter.

4.8.2 Format Character Register (FT)

See Data RAM Table Description for Specific Ad-

dress —

Read/Write

S1-S2. Character Size. The character size bits

specify the character size for each line as defined

in Table 15.

Table 15. Format Character Register Size

Setting

TDOT= 1/fosc

R, G, B. Colour. The 3 colour control bits define

the foreground colour of the following word as

shown in Table 16.

Table 16. Format Character Register Colour

Setting.

BGS. Background Select. The background select

bit selects the desired background for the following

word. There are two possible backgrounds defined

by the bits in the Background Control Register.

“0” The background on the following word is ena-

bled by BG0 and the colour is set by R0, G0,

and B0.

“1” The background on the following word is ena-

bled by BG1 and the colour is set by R1, G1,

and B1.

VSE. Vertical Space Enable. The vertical space

enable bit determines the spacing between lines.

“0” The space between lines is equal to 0H. The

alphanumeric character set is implemented in

a 13 x 16 format with one empty column to the

left and one empty row above and one below

and stored in a 14 x 18 format.

“1” The space between lines is defined by the val-

ues in the vertical space register and the value

of the VSS bit.

VSS. Vertical Space Select. If the VSE bit is set,

the value of this bit selects one of the two ver-

tical spaces contained in the vertical space

registers (VSR0 and VSR1). A “0” in this bit

selects the VSR0 value, a “1” selects the

VSR1 value, respectively.

Note. The first word of each line is always ena-

bled. If we desire the line to begin further to the

right we have two solutions: to increase the

HSAR register or to introduce a Space Char-

acter just after the Format Character. A Space

Character should also be used if we don’t want

the current line to be displayed.

BGS

VSS

VSE

Vertical

Height

Horizontal

length

18H

14 TDOT

36H

28 TDOT

54H

42 TDOT

72H

56 TDOT

Colour

Black

Blue

Green

Cyan

Red

Magenta

Yellow

White

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