ST6385 datasheet(51/84 Pages) STMICROELECTRONICS

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ST6365, ST6375, ST6385 ST6367, ST6377, ST6387

ON-SCREEN DISPLAY (Cont’d)

Vertical Space Register (VSR)

Address: 12h, Page 6 - Write only

Reset Value: XXh

Caution: This register contains at least one write

only bit. Single bit instructions (SET, RES, INC

and DEC) should not be used.

D7. This bit is not used

SCB. Screen Blanking. This bit allows the entire

screen to be blanked.

“0" - The blanking output signal (VBLK) is active

only when displaying characters.

“1" - The blanking output signal (VBLK) is always

active. Characters in the display RAM are

still displayed.

When this bit is set to one, the screen is blanked

also without setting the Global Enable bit to one

(OSD disabled).

VS5, VS0. Vertical Space. These bits determine

the spacing between lines if the Vertical Space En-

able bit (VSE) in the format character is one. If

VSE is zero there will be no spaces between lines.

The Vertical Space bits can specify one of 63

spacing values from 4H to 252H. The space be-

tween lines is defined by the following formula.

Space between lines = 4H(25(VS5) + 24(VS4) +

23(VS3) + 22(VS2) + 21(VS1) + 20(VS0))

The case of all Vertical Start Address bits being

zero is illegal.

Horizontal Space Register (HSR)

Address: 13h, Page 6 - Write only

Reset Value: XXh

Caution: This register contains at least one write

only bit. Single bit instructions (SET, RES, INC

and DEC) should not be used.

GS2,GS1. Global Size. These bits along with the

size bit (S) located in the Character format word

specify the character size for each line as defined

in Table 18.

Table 18. Horizontal

Space

Size

Setting

Note: TDOT=2/fOSC

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 2/fOSC to 128/fOSC. The formula

is shown below for the smallest size charac-

ter(18H). If larger size characters are being dis-

played the spacing between words will increase

proportionately. Multiply the value below by 2, 3 or

4 for character sizes of 36H, 54H and 72H respec-

tively.

Space between words (not including the space

character)=2/fOSC(1+25(HS5)+24(HS4)+23(HS3)

+22(HS2)+ 21(HS1)+20(HS0))

SCB

VS5

VS4

VS3

VS2

VS1

VS0

GS2

GS1

HS5

HS4

HS3

HS2

HS1

HS0

GS2 GS1

Vertical Height

Horizontal Length

18H

6 TDOT

36H

12 TDOT

18H

6 TDOT

54H

18 TDOT

36H

12 TDOT

54H

18 TDOT

36H

12 TDOT

72H

24 TDOT

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