參數(shù)資料
型號(hào)： SAA55XX
廠商： NXP Semiconductors N.V.
英文描述： TV microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD)
中文描述： 與隱藏字幕（CC）和屏幕顯示（OSD電視微控制器）
文件頁(yè)數(shù)： 64/84頁(yè)
文件大小： 352K
代理商： SAA55XX
2000 Feb 23
64
Philips Semiconductors
Preliminary specification
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
SAA55xx
18.10 Redefinable characters
A number of Dynamically Redefinable Characters (DRCs)
are available. These are mapped onto the normal
character codes, and replace the predefined ROM value.
There are 32 DRCs, the first 16 occupy the character
codes 80H to 8FH, the second 16 occupy the locations
90H to 9FH. This allows for 32 DRCs or 16 Special DRCs.
The remapping of the standard OSD to the DRCs is
activated when the TXT20.DRCS ENABLE bit is set.
The selection of Normal or Special OSD symbols is
defined by the TXT20.OSD PLANES.
Each character is stored in a matrix of 12
×
16
×
1
(V
×
H
×
planes), this allows for all possible character
matrices to be defined within a single location.
Fig.30 Organisation of DRC RAM.
handbook, full pagewidth
MBK969
CHARACTER 0
address (HEX)
character code
character 0
address (HEX)
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
80H
CHARACTER 1
81H
CHARACTER 2
82H
8800
881F
8820
883F
8840
885F
CHARACTER 30
9EH
CHARACTER 31
12 bits
9FH
8BC0
8BDF
8BE0
8BFF
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