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M37225M6 Datasheet(PDF) 68 Page - Renesas Technology Corp

Part # M37225M6
Description  SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M37225M6 Datasheet(HTML) 68 Page - Renesas Technology Corp

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M37225M6/M8/MA/MC-XXXSP, M37225ECSP
Rev.1.00
Nov 01, 2000
page 66 of 124
REJ03B0136-0100Z
(3) Memory for OSD
There are 2 types of memory for OSD : OSD ROM (addresses 1140016
to 13BFF16 and 1540016 to 17AFF16) used to specify character dot
data and OSD RAM (addresses 080016 to 0877) used to specify the
characters, colors, and attribute. The following describes each type
of memory.
Fig. 8.10.17 Character Font Data Storing Address
➀
OSD ROM (addresses 1140016 to 13BFF16, 1540016 to 17AFF16)
The dot pattern data for OSD characters is stored in the charac-
ter font area in the OSD ROM. To specify the kinds of the char-
acter font, it is necessary to write the character code (based on
OSD ROM address) 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
8.10.17.
OSD ROM address of character font data
AD16 AD15 AD14 AD13 AD12 AD11 AD10
AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
OSD ROM
address bit
1Line number
Font
bit
Line number /
Character code /
Font bit
Character code (low-order 8 bits)
0
Line number = “0A16” to “1D16”
Character code = “00016” to “17F16” (“07F16”, “08016” and “17F16” cannot be used.)
Font bit = 0: Left area
1: Right area
Character
code
(high-
order 1)
Character font
Line
number
OSD ROM
data
000016
7FF016
7FF816
601C16
600C16
600C16
600C16
600C16
601C16
7FF816
7FF016
630016
638016
61C016
60E016
607016
603816
601C16
600C16
000016
Left area
Right area
b0
b7
b0
b7
0A
11
0B
0C
0D
0E
0F
10
12
19
13
14
15
16
17
18
1D
1A
1B
1C


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