M37212M4 Datasheet, PDF (70/119 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

MITSUBISHI MICROCOMPUTERS
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
M37212EFSP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
8.10.8 OSD Output Pin Control
The OSD output pins R, G, B and OUT1 can also function as ports
P52–P55. Set corresponding bit of the port P5 direction register (ad-
dress 00CB16) to “0” to specify these pins as OSD output pins, or set
it to “1” to specify it as a general-purpose port P5.
The OUT2 can also function as port P10. Set bit 0 of the CRT port
control register (address 00EC16) to “1” (output mode). After that, set
bit 7 of the CRT port control register to “1” to specify the pin as OSD
output pin, or set it to “0” to specify as port P10.
The input polarity of the HSYNC, VSYNC and output polarity of signals
R, G, B, OUT1 and OUT2 can be specified with the CRT port control
register (address 00EC) . Set a bit to “0” to specify positive polarity;
set it to “1” to specify negative polarity (refer to Figure 8.11.13).
The CRT port control register is shown in Figure 8.10.17.
CRT Port Control Register
b7 b6 b5 b4 b3 b2 b1 b0
CRT port control register (CRTP) [Address 00EC16]
B
Name
Functions
After reset R W
0 HSYNC input polarity
switch bit (HSYC)
0 : Positive polarity input
1 : Negative polarity input
0 RW
1 VSYNC input polarity
switch bit (VSYC)
0 : Positive polarity input
1 : Negative polarity input
0 RW
2 R/G/B output polarity switch 0 : Positive polarity output
bit (R/G/B)
1 : Negative polarity output
0 RW
3 OUT2 output polarity
switch bit (OUT2)
0 : Positive polarity output
1 : Negative polarity output
0 RW
4 OUT1 output polarity
switch bit (OUT1)
0 : Positive polarity output
1 : Negative polarity output
0 RW
5 R signal output switch bit 0 : R signal output
(OP5)
1 : MUTE signal output
0 RW
6 G signal output switch
bit(OP6)
0 : G signal output
1 : MUTE signal output
0 RW
7 B signal output switch
bit(OP7)
0 : B signal output
1 : MUTE signal output
0 RW
Fig. 8.10.17 CRT Port Control Register
Rev. 1.0
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