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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
Register
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))
70
-
SCB
VS5
VS4
VS3
VS2
VS1
VS0
70
GS2
GS1
HS5
HS4
HS3
HS2
HS1
HS0
GS2 GS1
S
Vertical Height
Horizontal Length
0
18H
6 TDOT
0
1
36H
12 TDOT
0
1
0
18H
6 TDOT
0
1
54H
18 TDOT
1
0
36H
12 TDOT
1
0
1
54H
18 TDOT
1
0
36H
12 TDOT
1
72H
24 TDOT