P83C266BDR datasheet(68/92 Pages) PHILIPS

68 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

17.15 OSD meshing

Meshing results is a contrast reduction of a selected video

area. This reduced contrast enhances the reliability of the

OSD character displayed in that area without the loss of

the video information in that area in case of a normal solid

background. This feature is implemented by replacing the

normal character solid background by a checker-board

pattern background and inverts this pattern every new

frame. The checker-board pattern itself is generated by

switching FB on and off with a pixel frequency in the first

frame and off and on in the next frame only for those OSD

characters that have background switched on.

• The OSD character itself or its contrast is not affected by

the meshing feature

• The meshing function is frame based

• Normal background is replaced by an alternating

meshing pattern

• For meshing the meshing bit and the background mode

must be set

• Meshing can only be activated in TV mode, e.g mode bit

(bit 5 in SFR OSCON) must be a logic 0.

Fig.43 TV/video signal superimposed with checker-board pattern.

handbook, full pagewidth

MGM684

TAXI

OSD background colour

checker-board pattern

TV/Video colour

Fig.44 Complete meshing feature.

handbook, full pagewidth

MGM685

TAXI

VOLUME

OLUME IIII

IIII

OSD character

(not affected by the checker-board pattern

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