ST92196A datasheet(152/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

8.5.9 Register Description

To run the Display controller properly, you need to

program the 7 registers that configure the display

BORDER COLOR REGISTER 2 (OSDBCR2)

R246 - Read/Write

Reset Value: 0x00 0000

Bit 7 = B2BC

Background to Border Color control

bit.

This bit allows to force the background color of all

the characters to the border color.

0: All characters backgrounds are normally dis-

played

1: All character backgrounds are forced to the cur-

rent border color and translucency level.

Bit 6 = Reserved

Bits 5:3 = BOS[2:0]

Border color translucency

These bits control the Border color translucency.

BOS[2:0] = 7 means that the border color will be

fully opaque (no video mixed in it on the display)

BOS[2:0] = 0 means that the border color will be

fully transparent (the video is displayed instead of

this color)

Bits 2:0 = BOR[2:0]

Red Border color

These bits configure the red intensity for the bor-

der color.

BOR[2:0] = 0 means that no red is used to define

the border color.

BOR[2:0] = 7 means that the maximum red inten-

sity is used in the border color.

BORDER COLOR REGISTER 1 (OSDBCR1)

R247 - Read/Write

Reset Value: 0x00 0000

Bit 7 = DIFB

Digital FB control bit

This bit selects the Fast Blanking (FB) output as

analog or digital.

0: The FB DAC works as an 8-level DAC output

from 0V up to 1V (with a 500ohms internal im-

pedance to ground).

1: The FB DAC works as a 2-level DAC output, the

high level providing an amplitude higher than

2.7 volts. All translucency control bits are man-

aged as follows:

- the code (0,0,0) generates a “0” output (0 volt),

- all other codes generate a “1” output (>2.7 V).

Note: This applies to BT[2:0], FT[2:0], U2T[2:0],

U2T[2:0] and BOS[2:0] (refer to Section 8.5.6.3,

Section 8.5.6.4 and Section 8.5.6.1, and to the

OSDBCR2 register).

Bit 6 = Reserved

Bits 5:3 = BOG[2:0]

Green Border color

These bits configure the green intensity for the

border color.

BOG[2:0] = 0 means that no green is used to de-

fine the border color.

BOG[2:0] = 7 means that the maximum green in-

tensity is used in the border color.

Bits 2:0 = BOB[2:0]

Blue Border color

These bits configure the blue intensity for the bor-

der color.

BOB[2:0] = 0 means that no blue is used to define

the border color.

BOB[2:0] = 7 means that the maximum blue inten-

sity is used in the border color.

B2BC

BOS2

BOS1

BOS0

BOR2

BOR1 BOR0

DIFB

BOG2

BOG1

BOG0

BOB2

BOB1 BOB0

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