M37220M3-010SP MITSUBISHI [Mitsubishi Electric Semiconductor], M37220M3-010SP Datasheet - Page 37

• Manufacturer Part Number: M37220M3-010SP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER?
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

(8) CRT Output Pin Control
The CRT output pins R, G, B, and OUT can also function as ports
P5
rection register (address 00CB
output pins, or set it to “1” to specify it as a general-purpose port P5
pins.
The input polarity of signals H
signals R, G, B, and OUT can be specified with the bits of the CRT
port control register (address 00EC
positive polarity; set it to “1” to specify negative polarity. The struc-
ture of the CRT port control register is shown in Figure 38.
(9) Raster Coloring Function
An entire screen (raster) can be colored by setting the bits 5 to 7 of
the CRT port control register. Since each of the R, G, and B pins can
be switched to raster coloring output, 7 raster colors can be obtained.
If the R, G, and B pins have been set to MUTE signal output, a raster
coloring signal is output in the part except a no-raster colored char-
acter (in Figure 39, a character “O”) during 1 horizontal scanning
period. This ensures that character colors do not mix with the raster
color. In this case, MUTE signal is output from the OUT pin.
An example in which a magenta character “I” and a red character “O”
are displayed with blue raster coloring is shown in Figure 39.
Fig. 39. Example of raster coloring
2
H
R
B
OUT
, P5
SYNC
3
, P5
A
4
and P5
5
. Set the corresponding bit of the port P5 di-
SYNC
16
) to “0” to specify these pins as CRT
and V
16
) . Set a bit to “0” to specify
SYNC
and output polarity of
A'
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
Signals
across
A – A'
“RED”
“BLUE”
Fig. 38. Structure of CRT port control register
7
with ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M37220M3-XXXSP
0
R, G, B output polarity switch
bit
OUT output polarity switch
bit
R signal output switch bit
B signal output switch bit
CRT port control register
(CRTP : address 00EC
H
bit
V
bit
G signal output switch bit
SYNC
SYNC
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : R signal output
1 : MUTE signal output
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
0 : G signal output
1 : MUTE signal output
0 : B signal output
1 : MUTE signal output
input polarity switch
input polarity switch
16
)
37