SDA5523 Micronas Semiconductor, SDA5523 Datasheet - Page 101

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

DATA SHEET
These 2 SFR pointers are used to point to 2 × 3 other
pointers. These 6 pointers are pointing to the start
address of the following memory areas:
– Start address of character display area memory
– Start address of CLUT
– Start address of 1-bit DRCS characters matrixes
– Start address of 2-bit DRCS characters matrixes
– Start address of 4-bit DRCS characters matrixes
– Start address of global display word / cursor matrix
Table 2–79: Memory pointers
Micronas
Pointer Array
POINTFIELD0
POINTFIELD1
Start address
in Array
0
1
2
3
4
5
0
1
2
3
4
5
H
H
H
H
H
H
H
H
H
H
H
H
(LByte)
(HByte)
(LByte)
(HByte)
(LByte)
(HByte)
(LByte)
(HByte)
(LByte)
(HByte)
(LByte)
(HByte)
Name
DISPOINTh
CLUTPOINT
GDWCURPOINTh
DRC1POINTh
DRC2POINTh
DRC4POINTh
Sept. 10, 2004; 6251-556-3DS
User has to take care for a pointer definition so that
memory areas do not overlap each other on the one
hand and that the definition is optimized in a way, so
that no memory is wasted on the other hand. The
length of the global display word is fixed to 10 Byte and
the length of the CLUT is fixed to 2 × 48 Byte. The
length of all the other areas depend on the OSD
requirements
Section 2.13.9.4. on page 102).
Each of the six pointers to the memory areas is stored
in an array of pointers. Each pointer in this array has
got a width of 16 bits and uses 2 Bytes inside the
RAM.
Function
Pointer to display memory
Pointer to CLUT
Pointer to GDW and cursor matrix
Pointer 1-bit DRCS matrices
Pointer 2-bit DRCS matrices
Pointer 4-bit DRCS matrices
(see
also
Section 2.13.9.1.
SDA 55xx
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