M37271MF-252SP datasheet(74/97 Pages) MITSUBISHI

74 / 97 page

MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

(15) OSD Output Pin Control

The OSD output pins R, G, B, and OUT1 can also function as ports

P52, P53, P54 and P55. Set the corresponding bit of the OSD port

control register (address 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

pins. The OUT2, I1, and I2 can also function as port P10, P15, P16.

Set the corresponding bit of the port P1 direction register (address

00C316) to “1” (output mode). After that, switch between the OSD

output function and the port function by the OSD port control regis-

ter. Set the corresponding bit to “1” to specify the pin as OSD output

pin, or set it to “0” to specify as port P1 pin.

The input polarity of the HSYNC, VSYNC and output polarity of signals

R, G, B, I1, I2, OUT1 and OUT2 can be specified with the I/O polarity

control register (address 021716) . Set a bit to “0” to specify positive

polarity; set it to “1” to specify negative polarity (refer to Figure 64).

The structure of the OSD port control register is shown in Figure 83.

Fig. 83. Structure of OSD port control register

OSD port control register

(PF : address 00CB16)

Port P15 output signal selection bit

0 : Port P15 output

1 : I1 signal output

Port P16 output signal selection bit

0 : Port P16 output

1 : I2 signal output

Port P52 output signal selection bit

0 : R signal output

1 : Port P52 output

Port P53 output signal selection bit

0 : G signal output

1 : Port P53 output

Port P54 output signal selection bit

0 : B signal output

1 : Port P54 output

Port P55 output signal selection bit

0 : OUT1 signal output

1 : Port P55 output

Port P10 output signal selection bit

0 : Port P10 output

1 : OUT2 signal output

Fix this bit to “0.”

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