MITSUBISHI MICROCOMPUTERS
M37274EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
Extrafont
Notes 1 : When using the extra font, set bits 7 and 6 of the OSD
There are 16 kinds of the extra fonts configured with 16 ✕ 26 dots in
OSD ROM. This 16 kinds fonts can be displayed by ORed with the
character font by a character unit (refer to Figure 62). In only the
EXOSD mode, the extra font is controlled the following : bits 7 to 5 of
the color code 1 and bit 3 of the color code 2.
control register to “0” (refer to Figure 64).
2 : Extra fonts are always displayed by ORed with the char-
acter font. Accordingly, when displaying only a extra font,
set a blank for a character font and OR with it.
The extra font color for each screen is specified by the extra color
register. When the character font overlaps with the extra font, the
color of the area becomes the ORed color of both fonts.
Extra Font Color Register
b7b6 b5b4b3 b2b1b0
0 0
Extra font color register (EC) [Address 021916
]
B
0
Name
Functions
After reset
R W
R W
Extra font color R
control bit (EC0)
0 : No output
1 : Output
0
Extra font color G
control bit (EC1)
0 : No output
1 : Output
1
0
0
0
0
R W
R W
R W
Extra font color B
control bit (EC2)
0 : No output
1 : Output
2
3, 4
Fix these bits to “0.”
Nothing is assigned. These bits are write disable bits.
When these bits are read out, the values are “0.”
R
5
to
7
—
Fig. 86. Extra Font Color Register
16 dots
16 dots
16 dots
+
(OR)
Blank character font
Extra font specified by EX0 to EX3
Fig. 87. Display Example of Only Extra Font
89
RENESAS [ RENESAS TECHNOLOGY CORP ]
