Renesas PCA7400 Manual de usuario descargar pdf (Pagina 76)

MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

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

and ON-SCREEN DISPLAY CONTROLLER

(16) Raster Coloring Function

An entire screen (raster) can be colored by setting the bits 6 to 0 of

the raster color register. Since each of the R, G, B, I1, I2, OUT1, and

OUT2 pins can be switched to raster coloring output, 7 raster colors

can be obtained.

If the OUT1 pin has been set to raster coloring output, a raster color-

ing signal is always output during 1 horizontal scanning period. This

setting is necessary for erasing a background TV image.

If the R, G, B, I1, and I2 pins have been set to output, a raster color-

ing signal is output in the part except a no-raster colored character

(in Figure 85, a character “1”) during 1 horizontal scanning period.

This ensures that character colors are not mixed with the raster color.

The structure of the raster color register is shown in Figure 84, the

example of raster coloring is shown in Figure 85.

Fig. 84. Structure of raster color register

Fig. 85. Example of raster coloring

SYNC

OUT1

: Character color “RED” (R)

: Border color “GREEN” (G)

: Background color “MAGENTA” (R and B)

: Raster color “BLUE” (R and OUT1)

Signals

across

A-A'

Raster color register

(RC : address 0218

)

Raster color R control bit

0 : No output

1 : Output

Raster color G control bit

0 : No output

1 : Output

Raster color B control bit

0 : No output

1 : Output

Raster color I1 control bit

0 : No output

1 : Output

Raster color I2 control bit

0 : No output

1 : Output

Raster color OUT1 control bit

0 : No output

1 : Output

Raster color OUT2 control bit

0 : No output

1 : Output

OSD interrupt source

selection bit

0 : Interrupt occurs at end

of OSD or EXOSD block

display

1 : Interrupt occurs at end

of CC mode block display

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 97 98

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