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

P83C266BDR Datenblatt(PDF) 68 Page - NXP Semiconductors

P83C266BDR Datenblatt(HTML) 68 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

Datenblatt Download

Link URL