M37281EKSP Datasheet, PDF (83/172 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M37281MAH–XXXSP,M37281MFH–XXXSP,M37281MKH–XXXSP, M37281EKSP
8.11.6 Memory for OSD
There are 2 types of memory for OSD : OSD ROM (addresses
1080016 to 157FF16 and 1800016 to 1ACFF16) used to specify char-
acter dot data and OSD RAM (addresses 070016 to 07A716 and
080016 to 0FDF16) used to specify the kinds of display characters,
display colors, and SPRITE display. The following describes each
type of memory.
(1) OSD ROM (addresses 1080016 to 157FF16, 1800016 to
1ACFF16)
The dot pattern data for OSD characters is stored in the charac-
ter font area in the OSD ROM and the CD font data for OSD
characters is stored in the color dot font area in the OSD ROM.
To specify the kinds of the character font and the CD font, it is
necessary to write the character code into the OSD RAM.
The modes are selected by bit 3 of the OSD control register 3 for
each screen.
The character font data storing address is shown in Figure 8.11.20.
The CD font data storing address is shown in Figure 8.11.21.
The 510 kinds of character font and 62 kinds of CD font can be
stored.
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 /
Area bit
10
Line number
Character code
Area
bit
Line number = “0216” to “1516”
Character code = “0016” to “1FF16” (“0FF16” and “10016” can not be used. Write “FF16” to corresponding addresses.)
Area bit = 0: Left area
1: Right area
Line
number
b7
0216
0316
0416
0516
0616
0716
0816
0916
0A16
0B16
0C16
0D16
0E16
0F16
1016
1116
1216
1316
1416
1516
Left area
b0 b7
Right area _b0
Character font
Fig. 8.11.20 Character Font Data Storing Address
Rev.1.01 2003.07.16 page 83 of 170