M37161M8/MA/MF-XXXSP/FP,M37161EFSP/FP
8.10.5 Memory for OSD
(1) OSD ROM
There are 2 types of memory for OSD: OSD ROM used to store
character dot data and OSD RAM used to specify the characters and
colors to be displayed.
Character font data is stored in the character font area of OSD ROM,
and color dot font data is stored in color dot font area.To specify the
kinds of character font, it is necessary to write the character code
into the OSD RAM.
OSD ROM : addresses 1140016 to 13BFF16,
addresses 1D40016 to 1FBFF16
The storing address of character font data is shown in Fig. 8.10.15,
and the storing address of color dot font data is shown in Fig. 8.10.16.
A character font is 254 kinds,color dot font is 62 kinds is storable.
OSD RAM : addresses 080016 to 087F16
OSD ROM address of character font data
OSD ROM
AD16 AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0
address bit
Font
bit
Line number/character
0
0
1
Line number
Character code
code/font bit
= “0A16” to “1D16”
Line number
Character code
Font bit
= “0016” to “FF16” (“7F16” and “8016” cannot be used)
= 0 : Left area
1 : Right area
Data in
OSD
ROM
Line
number
Left
area
Right
area
b7
b0 b7
b0
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
000016
7FF016
7FF816
601C16
600C16
600C16
600C16
600C16
601C16
7FF816
7FF016
630016
638016
61C016
60E016
607016
603816
601C16
600C16
000016
Character font
Fig. 8.10.15 Character Font Data Storing Address
Rev.1.00 2003.11.25 page 62 of 128
RENESAS [ RENESAS TECHNOLOGY CORP ]
