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| 型号： | P87C766 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Microcontrollers for PAL/SECAM TV with OSD and VST |
| 中文描述： | 微控制器对于PAL / SECAM电视的OSD和伟仕 |
| 文件页数： | 66/92页 |
| 文件大小： | 382K |
| 代理商： | P87C766 |
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1999 Mar 10
66
Philips Semiconductors
Product specification
Microcontrollers for PAL/SECAM TV
with OSD and VST
P8xCx66 family
17.12 Maximum number of characters per row
The number of characters per row is a function of the OSD
clock frequency and the TV standard used.
The active video signal period of a horizontal line is
53.5
μ
s. However, in order to reduce jittering at the screen
edge, overscan is normally applied by the TV
manufacturer and this reduces the visible video signal
period to 48.15
μ
s.
The examples given below show how the number of
characters per row and the character width may be
obtained for the NTSC 525LPF/60 Hz TV standard using
different OSD clock frequencies.
17.12.1 NTSC 525LPF/60 Hz; f
OSD
= 6 MH
Z
As f
OSD
= 6 MHz; T
OSD
= 0.1666
μ
s
The number of visible dots on one horizontal line is 290
(48.15
μ
s/0.1666
μ
s)
Each character is composed of a 12 x 18 dot matrix;
therefore the maximum number of characters on one
line is 24 (290/12)
If a 19 inch TV screen is used, the width of a horizontal
line is approximately 370 mm and this gives a character
width of 15.4 mm (370/24).
17.12.2 NTSC 525LPF/60 H
Z
; f
OSD
= 10 MH
Z
As f
OSD
= 10 MHz; T
OSD
= 0.1
μ
s
The number of visible dots on one horizontal line is 481
(48.15
μ
s/0.1
μ
s)
Each character is composed of a 12 x 18 dot matrix;
therefore the maximum number of characters on one
line is 40
If a 19 inch TV screen is used, the width of a horizontal
line is approximately 370 mm and this gives a character
width of 9.25 mm.
17.13 Maximum number of rows per frame
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 two examples shown below illustrate how the
maximum number of rows per frame is obtained for
different TV scanning standards.
17.13.1 NTSC 525LPF/60 H
Z
The number of active lines per field for this standard is
between 241.5 and 249 H. If the value of 241 is used then
the maximum number of rows per frame is 13.
17.13.2 PAL 625LPF/50 H
Z
The number of active lines per field for this standard is 280.
Therefore, the maximum number of rows per frame is 15.
N
18
number of active lines per field
=
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