Lucent Technologies MN102F85K User Manual

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The OSD is constructed so the display start position is the field (field 1) where 
the EOMON bit is 1. However, interlaced displays may require that the start 

position be a field (field 2) where the EOMON bit is 0. In this case, merely com-
plementing the EOSEL bit will not result in a correct display. You must set the 

following two bits to have the display start at field 2.

♦

CANH (x’007F0A’, bit 4): Set to 1.

0: Normal display
1: Slide the field 1 display position down 1 line

♦

EOSEL (x’007F0E’, bit 10): Complement the value EOSEL has for 
field 1 in a normal display.

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To implement text-layer scrolling in the closed-caption mode, the program must 

constantly switch the text display fields. This can cause the text lines to display 
incorrectly. To prevent this, set the following bits to fix the text lines to the even 

or odd field characters while scrolling.

♦

BFLD (x’007F0A’, bit 2): Set to 1 to enable scrolling.

0: Normal display
1: Display the same characters in fields 1 and 2

♦

EONL (x’007F0A’, bit 3): Set to 0 or 1.
0: Fix to characters in field 1

1: Fix to characters in field 2

0

Load to N2 next

N1 > N2

0

1

N1 < N2

1

0

N1 = N2

Complement previous Complement previous

1

Load to N1 next

N1 > N2

1

0

N1 < N2

0

1

N1 = N2

Complement previous Complement previous