VX1828B
Preliminary Datasheet
Video Processor for Middle Size LCD Panel
P.23/P.64
V1.0 050420
command memory is able to store up 256 indexes. In other words, the monitor screen would be able to
show at most 256 characters at a time for the OSD display.
The command memory is roughly separated into three blocks for title, content, and bottom block
displays. Except the title block is always located at the top of the command memory address, the
content and the bottom blocks are located according to the registers, OSDC_START (5Fh.7-0) and
OSDB_START (6Dh.7-0). For example (
Figure 5.5
), if we would like to show “VXIS” as the title block,
“Hello!” as the content block, and “OK” as the bottom block, the command memory will then be
configured as follows.
Indexes from
Font Memory
.
.
70h
.
.
00h
02h
01h
03h
15h
19h
18h
17h
16h
1Ah
.
.
.
.
OSDC_START
OSDB_START
VXIS
Hello!
OK
15h (V)
17h (X)
08h (I)
12h (S)
07h(H)
1Eh (e)
25h (l)
25h (l)
28h (o)
43h (!)
0Eh (O)
0Ah (K)
Attribute for V
Attribute for X
Attribute for I
Attribute for S
Attribute for H
Attribute for e
Attribute for l
Attribute for l
Attribute for o
Attribute for !
Attribute for O
Attribute for K
Addr.
Attribute
Setting
Figure 5.5 OSD Command Memory
