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| SDA55XX Datasheet, PDF (175/230 Pages) Infineon Technologies AG – Preliminary & Confidential | |||
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SDA 55xx
Preliminary & Confidential
Display
18.3.1 Access of Characters
The DRCS characters and ROM characters are accessed by a 10-bit character
address inside character display word (CDW; see also 18.3).
18.3.1.1 Address Range from 0d to 767d
This address range can either be used to access ROM characters or to access
1-bit DRCS characters:
CHAAC
0
1
Description
Normal mode:
Address range 0d - 767d is used to access ROM characters
Enhanced mode:
Address range 0d - 767d is used to access 1-bit DRCS characters
see also 18.4 / Global Display Word (GDW)
18.3.1.2 Address Range from 768d to 1023d
The address range from 768d to 1023d is reserved to address the DRCS
characters. This range is splitted in three parts for 1-bit DRCS, 2-bit DRCS and
4-bit DRCS. The boundary between 1-bit DRCS and 2-bit DRCS as well as the
boundary between 2-bit DRCS and 4-bit DRCS are defined by two boundary
pointers inside global display word (see also 18.4):
Boundary Pointer 1:
DRCS DRCS DRCS DRCS Description
B1_3 B1_2 B1_1 B1_0
0
0
0
0 Boundary1 set to 768d
0
0
0
1 Boundary1 set to 784d
0
0
1
0 Boundary1 set to 800d
0
0
1
1 Boundary1 set to 816d
....
....
1
1
1
0 Boundary1 set to 992d
1
1
1
1 Boundary1 set to 1008d
see also 18.4 / Global Display Word (GDW)
Boundary Pointer 2:
Please notice: DRCSB2_3...DRCSB2_0 must be set to a greater or a equal
value than DRCSB1_3...DRCSB1_0.
Semiconductor Group
175
Userâs Manual July 99
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