M3727GM6 Datasheet, PDF (87/129 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M3727GM6/M8–XXXSP/FP M37272E8SP/FP
8.11.13 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 OSD port control 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 port P1
direction register (address 00C316) to “1” (output mode). After that,
set bit 7 of the OSD 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 I/O polarity con-
trol register (address 00D8) . Set a bit to “0” to specify positive polar-
ity; set it to “1” to specify negative polarity (refer to Figure 8.11.13).
The structure of the OSD port control register is shown in Figure
8.11.28.
OSD Port Control Register
b7 b6 b5 b4 b3 b2 b1 b0
00
OSD port control register (PF) [Address 00CB16]
B
Name
0, 1 Fix these bits to 0.
Functions
2 Port P52 output signal
selection bit (PF2)
0 : R signal output
1 : Port P52 output
3 Port P53 output signal
selection bit (PF3)
0 : G signal output
1 : Port P53 output
4 Port P54 output signal
selection bit (PF4)
0 : B signal output
1 : Port P54 output
5 Port P55 output signal
selection bit (PF5)
0 : OUT1 signal output
1 : Port P53 output
6 Nothing is assigned. This bit is write disable bit.
When this bit is read out, the value is 0.
7 Port P10 output signal
selection bit (PF7)
0 : Port P10 output
1 : OUT2 signal output
After reset R W
0R
0 RW
0 RW
0 RW
0 RW
0R
0 RW
Fig. 8.11.28 OSD Port Control Register
Rev.1.00 Apr 01, 2001 page 87 of 127
REJ03B0132-0100Z