ST6391 datasheet(52/68 Pages) STMICROELECTRONICS

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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 between lines

is defined by the following formula.

Space between lines = 4H(2

5(VS5) + 24(VS4) +

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

The case of all Vertical Start Address bits being

zero is illegal.

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 13.

Table 13. Horizontal Space Register Size

Setting.

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

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 tdots 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 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 (not including the space

character)=2/fosc(1+2

5(HS5)+24(HS4)+23(HS3)

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

ON-SCREEN DISPLAY (Continued)

VSR

Vertica l Space Register

(12h - Page 6, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

VS5-VS0 = Vertical Space

SCB = Screen Blanking bit

Unused

Figure 62. Vertical Space Register

HSR

Horizontal Space Register

(13h - Page 6, Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

HS5-HS0 = Horizontal Space

GS1 = Global Size Bit 1

GS2 = Global Size Bit 2

Figure 63. Horizontal Space Register

ST6391,92,93,95,97,99

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