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參數(shù)資料
| 型號(hào)： | SAA569x |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Enhanced TV microcontrollers with On-Screen Display (OSD) |
| 中文描述： | 與微控制器在強(qiáng)化電視屏幕顯示（OSD） |
| 文件頁數(shù)： | 92/116頁 |
| 文件大小： | 532K |
| 代理商： | SAA569X |
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2002 May 06
92
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA567x; SAA569x
23.11.3 S
CREEN COLOUR DISPLAY AREA
This area is covered by the screen colour, and starts with
a fixed offset of 8
μ
s from the leading edge of the
horizontal sync pulse in the horizontal direction. A vertical
offset is not necessary. For a summary, see the following:
Horizontal:
Start at 8
μ
s after leading edge of horizontal
sync for 56
μ
s
Vertical:
Line 9, field 1 (321, field 2) to leading edge of
vertical sync (line numbering using 625 Standard).
23.11.4 T
EXT DISPLAY AREA
(
SINGLE PAGE
)
The text area can be defined to start with an offset in both
the horizontal and vertical directions. For a summary, see
following:
Horizontal:
Up to 48 full-sized characters per row. Start
position setting from 3 to 64 characters relative to
HSYNC delay. Fine adjustment in quarter characters.
Vertical:
256 Lines (nominal 41 to 297). Start position
setting from leading edge of vertical sync, legal values
are 4 to 64 lines (line numbering using 625 Standard).
The horizontal offset is set in MMR Text Area Start. The
offsetisdoneinfull-widthcharactersusingTAS<5:0>,with
quartercharactersusingHOP<1:0>forfinesetting.Values
00H to 03H for TAS<5:0> result in a corrupted display.
The width of the text area is defined in the Text Area End
Register by setting the end character value TAE<5:0>.
This number determines where the background colour of
the text area will end if set to extend to the end of the row.
It will also terminate the character fetch process, thus
eliminating the necessity of a
row end
attribute. However,
this entails writing to all positions.
The vertical offset is set in the Text Position Vertical
Register. The offset value VOL<5:0> is done in number of
TV scan lines.
Note that the Text Position Vertical Register should not be
set to 00H as the Display Busy interrupt is not generated
in these circumstances.
23.11.5 T
EXT
D
ISPLAY
A
REA
(T
WO
_P
AGE
)
Control of Page A in two page mode is as per the control
in single page mode. Three extra memory mapped
registers control the position of the second page: the Text
Area Start B, Text Area End B and the Page B Position
Register.
Page B positioning register controls the positioning of Text
Area BrelativetoHSYNCdelay.Aminimumtwocharacter
gap should be allowed between each page to allow the
reset of attributes.
The vertical offset must be the same for both pages, i.e.
RANGE<1:0> and VOL<5:0> = RANGEB<1:0> and
VOLB<5:0> in Text Position Vertical and Vertical Range
Registers (MMR 87F1H, MMR 87E3H and MMR 87E4H).
The text area can be defined to start with an offset in the
horizontal direction, as follows:
Up to 48 full-sized characters per row. Start position
setting from 3 to 64 characters relative to value in
Page B position register. Fine adjustment in quarter
characters.
The horizontal offset is set in the Text Area Start
Register. The offset is done in full-width characters
using TAS B<5:0>, with quarter characters using HOP
B<1:0> for fine setting.
The width of the textarea isdefined in the Text AreaEnd
RegisterbysettingtheendcharactervalueTAEB<5:0>.
This number determines where the background colour
of the Text Area B will end if set to extend to the end of
the row. It will also terminate the character fetch process
thus eliminating the necessity of a row end attribute.
However, this entails writing to all positions.
23.12 Character set
To facilitate the global nature of the device, the character
setcanaccommodatealargenumberofcharacters,which
can be stored in different matrices.
23.12.1 C
HARACTER MATRICES
The character matrices that can be accommodated in both
display modes are:
(H
×
V
×
planes) 12
×
9
×
1, 12
×
10
×
1, 12
×
13
×
1 and
12
×
16
×
1.
These modes allow two colours per character position.
In CC mode, two additional character matrices are
available to allow four colours per character:
(H
×
V
×
planes) 12
×
13
×
2 and 12
×
16
×
2.
The characters are stored physically in ROM in a 12
×
10
or 12
×
16 matrix.
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