SDA5523 Micronas Semiconductor, SDA5523 Datasheet - Page 70

• Manufacturer Part Number: SDA5523
• Description: SDA55xx TVText Pro
• Manufacturer: Micronas Semiconductor

SDA 55xx
2.13.3. Display Memory
The display memory is located inside the internal
XRAM.
The start address of the display memory is at memory
address DISPOINT
by the user due to a pointer. For each character posi-
tion three Bytes in the display memory are reserved.
These three Bytes are stored in a serial incremental
order for each character and used to define the display
attributes of each single character position. The com-
plete amount of allocated display memory depends on
the display resolution. In vertical direction the charac-
ter display area is fixed to 25 rows. In horizontal direc-
tion the character display area can be adjusted from
33 up to 64 columns. Table 2–44 is an example for a
character display area resolution of 25 rows and
40 columns.
Table 2–45: Character display word: RAM location: Display memory
70
Byte
Pos.
0
1
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CHARADDRESS
Name
CHAR0
CHAR1
CHAR2
CHAR3
CHAR4
CHAR5
CHAR6
CHAR7
CHAR8
CHAR9
FLASH
UH
DH
DW
BOX
CLUT0
H
. This memory address is defined
Function
Used to choose a ROM or DRCS charac-
ter
Control of flash modes
Upper half double height
Double height
Double width
Control for Boxes
Bit0/CLUT select
H
=
DISPOINT
H
Sept. 10, 2004; 6251-556-3DS
+
(
Y
CH
×
(
(
DISALH4…DISALH0
2.13.4. Parallel Character Attributes
The character display area content of each character
position is defined by a 3 Byte character display word
(CDW; see also Section 2.13.9.1. on page 102) in dis-
play memory.
Following formula helps to calculate a memory
address of a character position (X
on the count of characters in horizontal direction
(defined
(DISALH4 … DISALH0)
DISPOINT
H
Remark
DRCS characters are defined by the user.
Up to 16 different colors can be used
within one DRCS; see also see
Section 2.13.4.1.
See also Section 2.13.4.4.
See also Section 2.13.4.5.
See also Section 2.13.4.5.
See also Section 2.13.4.6.
See also Section 2.13.7.4.
See also Section 2.13.7.5.
:
in
)
H
+
21
H
the
)
+
H
X
) and a display start address
CH
×
3
binary
H
)
CH
, Y
CH
DATA SHEET
) depending
parameters
Micronas