ST6380 datasheet(54/82 Pages) STMICROELECTRONICS

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ST6380, ST6381, ST6382, ST6383, ST6388, ST6389

ON-SCREEN DISPLAY (Cont’d)

Horizontal Space Register (HSR)

Address: 3Bh - Page 5

—

Read/Write

RDIS. Rounding DISable. This bit disable the

rounding function for the following screen. It allows

the display of some special characters which could

be modified by the rounding function.

“0”Rounding function enable

“1”Rounding function disable

FSB. Full Screen Background. This bit allows the

entire screen to be filled with a one colour back-

ground. The background is controlled by the back-

ground select bit (BGS). During this mode the dis-

play of characters is possible.

“0”No Full Screen Background

“1”Full Screen Background is active

Note: The full screen background bit has priority

over the background enable bits (BK0 and BK1)

and on the screen blanking bit. This means that if

the two backgrounds are disabled and the screen

blanking is active, the full screen background will

still be displayed.

HS5, HS0. Horizontal Space. These bits deter-

mine the spacing between words if the Horizontal

Space Enable bit (HSE) located in the space char-

acter is a one. The space between words is then

equal to the width of the space character plus the

number of dots specified by the Horizontal Space

bits. The 6 bits can specify one of 64 spacing val-

ues ranging from 1/fosc to 64/fosc. The formula is

shown below for the smallest size character(18H).

If larger size characters are being displayed the

spacing between words will increase proportion-

ately. Multiply the value below by 2, 3 or 4 for char-

acter sizes of 36H, 54H and 72H respectively.

Space between words =2/f

OSC(1+2

(HS5)+24

(HS4)+23 (HS3) +22 (HS2)+ 21 (HS1)+20 (HS0))

Note: This size does not include the width of the

space character.

The case of all Vertical Start Address bits being

zero is illegal.

Background Control Register (BCR)

This register sets up two possible backgrounds.

The background select bit (BGS) in the format or

space character will determine which background

is selected for the current word.

Background Control Register

Address: 3Ch - Page 5

—

Read/Write

R1,R0,G1,G0,B1,B0. Background Colour.

These bits define the colour of the specified back-

ground, either background 1 or background 0 as

defined in table below.

Table 19. Background Register Colour Setting.

BK1,BK0. Background Enable.These bits deter-

mine if the specified background is enabled or not.

“0” The word having this background specified

has not a background.

“1” The word having this background specified

has a background of the colour selected by the

corresponding RGB bits.

RDIS

FSB

HS5

HS4

HS3

HS2

HS1

HS0

BK1

BK0

Colour

Black

Blue

Green

Cyan

Red

Magenta

Yellow

White

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