ST92195D datasheet(131/249 Pages) STMICROELECTRONICS

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ST92195C/D - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

SCROLLING

CONTROL

HIGH

(SCHR)

R249 - Read/Write

Reset Value: 0000 0000b (00h)

Bit 7 = DH:

Global Double Height control bit.

This bit must only be used in Page Mode. When

DH is set, the display is turned in double height in-

cluding the header, excluding the vertical offset

before the display area. The status rows are not

affected by the DH bit and they remain in normal

height. Depending on the value of the UP/D con-

trol bit, when DH is set, the first or second half of

the page is displayed in double height. This bit as-

sumes a zooming function.

Notes:

– In global double height, when the top half page

is displayed, if row 11 has a double height at-

tribute, the first status row is corrupted. To avoid

this effect, save row 11, remove the serial double

height attribute from this row and display the up-

per part of the page. Then, before displaying the

lower part of the page, restore the serial DH at-

tribute in row 11.

– When the bottom half page is displayed, if row 23

has a double height attribute, the first status row

is not displayed. To avoid this effect remove the

serial double height attribute from row 23.

Bit 6 = EER:

End of Extra Row flag bit.

This bit is forced to "1" by hardware when the last

line of the extra row is displayed in case of scroll-

ing in normal height. This bit is Read only.

In Global double height, the EER bit is set to "1"

each time the last line of a new displayed row ap-

pears.

Bit 5 = UP/D:

Scrolling Up/Down

This bit has two functions: to control the scrolling

direction and to select the half part of the page in

Global Double Height display.

Scrolling direction:

0: Top-Down shift

1: Bottom-up shift

Half-page selection:

When DH is set, if UP/D is set, the upper half of the

page is displayed (i.e. Header and the page rows 1

to 11).

When DH is set, if UP/D is reset, the lower half of

the page is displayed (i.e. rows 12 to 23 and the

Status rows).

The UP/D control bit must be defined before set-

ting the Global height (DH bit); changing UP/D af-

ter DH is set, will not change the already selected

half page.

Bits 4:0 = LRS[4:0]:

Last row to be scrolled (1 to

23). In case of scrolling in global double height, the

Last row must be equal to 0x 10111 to display the

status row in the two half pages.

EER

UP/D

LRS4

LRS3

LRS2

LRS1

LRS0

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