M306V0ME-107FP MITSUBISHI [Mitsubishi Electric Semiconductor], M306V0ME-107FP Datasheet - Page 176

• Manufacturer Part Number: M306V0ME-107FP
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

176
Figure 2.16.19 OSD control register 4
2.16.6 Memory for OSD
There are 2 types of memory for OSD : OSD ROM (addresses 90000
character dot data and OSD RAM (addresses 0400
characters, display colors, and SPRITE display. The following describes each type of memory.
(1) ROM for OSD (addresses 90000
OSD control register 4
The dot pattern data for OSD characters is stored in the character 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.
For character font, there are the following 2 mode.
• OSDL enable mode
• OSDL disable mode
The modes are selected by bit 3 of the OSD control register 3 for each screen.
The character font data storing address for OSDL enable/OSDL disable mode are shown in Figures
2.16.20 and 2.16.21. The conditions for each OSDL enable/disable mode are shown in Figure
2.16.22. The CD font data storing address is shown in Figure 2.16.23.
b7
16
16
b6
b5
20-dot font and 24
20-dot font
b4
b3
b2
b1
b0
Bit symbol
Nothing is assigned.
In an attempt to write to these bits, write “0.” The value, if read, turns out to be “0.”
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
OC40
OC41
32-dot font
Symbol
OC4
OSDL mode
selection bit
Number of horizontal
display characters
selection bit
16
to AFFFF
Bit name
Address
025F
16
16
)
16
to 0FFF
0 : OSDL enable mode
1 : OSDL disable mode
0 : 32 characters for each block
1 : 42 characters for each block
(32-character mode)
(42-character mode)
When reset
XXXXX00
16
Function
) used to specify the kinds of display
and ON-SCREEN DISPLAY CONTROLLER
2
MITSUBISHI MICROCOMPUTERS
16
M306V0ME-XXXFP
to AFFFF
M306V0EEFP
16
) used to store
R
W
Rev. 1.0