ST6381 datasheet(55/82 Pages) STMICROELECTRONICS

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ST6380, ST6381, ST6382, ST6383, ST6388, ST6389

ON-SCREEN DISPLAY (Cont’d)

Vertical Space Register 1 (VSR1)

Address: 3Dh - Page 5

—

Read/Write

D7. This bit is not used

FF_SH. Full fringe / shadow background select.

This bit selects between the fringe and shadow

backgrounds for the smallest size (18H) charac-

ters, provided that the FR bit is also set.

“1” The 18H characters are surrounded by a

fringe background. (Provided that FR bit is set

and the selected background is active). This

consists of a one dot wide contour in the back-

ground colour

“0” The 18H characters have a shadow back-

ground. (provided also that FR bit is set and

the selected background is active). This con-

sists of a one dot wide line on the right and

lower sides of the character.

VS5, VS0. Vertical Space. These bits determine

the spacing between lines if the Vertical Space En-

able bit (VSE) in the format character is set and

the Vertical Space Select bit (VSS) is set. 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(25 (VS5) + 24 (VS4) +

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

Note: The case of all Vertical Space bits being

zero is not legal.

FF_SH

VS5

VS4

VS3

VS2

VS1

VS0

ST6381 Scheda tecnica(PDF) 55 Page - STMicroelectronics