M3727GM6 Datasheet, PDF (72/129 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M3727GM6/M8–XXXSP/FP M37272E8SP/FP
8.11.5 Memory for OSD
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.
<M3727GM6/M8-XXXSP/FP, M37272E8SP/FP>
OSD ROM : addresses 140016 to 3BFF16
OSD RAM : addresses 080016 to 087F16
(1) OSD ROM (addresses 140016 to 3BFF16)
The dot pattern data for OSD characters is stored in OSD ROM. To
specify the kinds of the character font, it is necessary to write the
character code into the OSD RAM.
Data of the character font is specified shown in Figure 8.11.15.
OSD ROM address of character font data
OSD ROM
address bit
AD16 AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0
Line number/character
code/font bit
1
0
0
Line number
C haracter code
Font
bit
Line number ^{= 0A16 to 1D16}
Character code ^{= 0016 to FF16 ( 7F16 and 8016 cannot be used)}
Font bit
= 0 : Left area
1 : Right area
Line
number _b7
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
Left
area
b0 b7
Right
area
Character font
Data in
OSD
b0 ROM
000016
7FF016
7FF816
601C16
600C16
600C16
600C16
600C16
601C16
7FF816
7FF016
630016
638016
61C016
60E016
607016
603816
601C16
600C16
000016
Fig. 8.11.15 Character Font Data Storing Address
Rev.1.00 Apr 01, 2001 page 72 of 127
REJ03B0132-0100Z