ST6391 datasheet(48/68 Pages) STMICROELECTRONICS

48 / 68 page

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 ofalphanumericcharac-

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.

D7. Not used.

D6. This pin is fixed to “1”.

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

colour of the following word as shown in Table be-

low.

Space Character Register Colour Setting.

Colour

Black

Blue

Green

Cyan

100

Red

Magenta

Yellow

White

BGS. Background Select. The background select

bit selects the desired background for thefollowing

word. There are two possible backgrounds defined

by the bits in the Background Control Register.

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

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

and B0.

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

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

and B1.

ON-SCREEN DISPLAY (Continued)

Space Character Format

See Data RAM Table Description

for Specific Address

( Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

HSE = Horizontal Space Enable

WE = Word Enable Bit

BGS = Backround Select

B = B Colour Bit

G = G Colour Bit

R = R Colour Bit

Fixed to “1”

Unuse d

Figure 56. Space Character Register

Explanation

ST6391,92,93,95,97,99

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