PCA8514T PHILIPS [NXP Semiconductors], PCA8514T Datasheet - Page 48
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PCA8514T
Manufacturer Part Number
PCA8514T
Description
Stand-alone OSD
Manufacturer
PHILIPS [NXP Semiconductors]
Datasheet
1.PCA8514T.pdf
(64 pages)
- Current page: 48 of 64
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Philips Semiconductors
12.3
The number of rows per frame is a function of the number
of active lines per display field and the number of vertical
dots in the character matrix (which is 18). The number of
rows per frame (N) is calculated as shown below.
The four examples shown below illustrate how the
maximum number of rows per frame is obtained for each
TV scanning standard.
12.3.1
The number of active lines per field for this standard is
between 241.5 and 249H (see Fig.41). If the value of 241
is used then the maximum number of rows per frame is 13.
1995 Nov 27
N
Stand-alone OSD
=
number of active lines per field
-------------------------------------------------------------------------------- -
Maximum number of rows per frame
NTSC 525LPF/60 H
18
Z
48
12.3.2
The number of active lines per field for this standard is 280.
Therefore, the maximum number of rows per frame is 15.
12.3.3
For this standard the number of active lines per frame is
double that of the NTSC 525LPF/60 Hz standard.
However, as HSYNC is divided by two internally, the
maximum number of rows per frame is also 13.
12.3.4
With this standard it is not necessary to divide HSYNC by
two as both the horizontal and vertical frequency are
doubled. The maximum number of rows per frame is 15.
PAL 625LPF/50 H
NTSC 1050LPF/60 H
PAL 1250LPF/100 H
Z
Z
Z
Product specification
PCA8514
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