ST92185B datasheet(126/178 Pages) STMICROELECTRONICS

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ST92185B - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

SCROLLING

CONTROL

LOW

(SCLR)

R248 - Read/Write

Reset Value: 0000 0000 (00h)

Bit 7 = SCE:

Scrolling Enable

Before enabling scrolling, the scrolling area must

be defined by the FRS[4:0] and LRS[4:0] bits. The

scrolling direction is defined by the UP/D bit.

0: Disable scrolling

1: Enable scrolling

Bit 6 = FSC:

Freeze scrolling

Note: The 2 control bits SCE and FSC must be set

to "1" before enabling the Global double height

(see the DH bit in the SCHR register).

Bit 5 = SS:

Scrolling Speed Control bit.

0: The display is shifted by 2 TV lines at each TV

frame (i.e. after 2 Vertical sync pulses).

1: The display is shifted by 4 TV lines at each TV

frame.

Bit 4:0 = FRS[4:0]: These bits define the upper-

most Row value to be scrolled (rows are num-

bered from 1 to 23). In case of global double height

mode programming, FRS[4:0] must mandatorily

be equal to 00000.

Table 26. Scrolling Control Bits

SCE

FSC

FRS4

FRS3

FRS2

FRS1

FRS0

SCE

FSC

UP/D

FRS[4:0] LRS[4:0]

Meaning

No Global Double Height, No Scrolling

No Global Double Height, Scroll up

No Global Double Height, Scroll down

Global Double Height, No Scrolling, Display top half

Global Double Height, No Scrolling, Display bottom half

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