M37207M8-059SP datasheet(70/121 Pages) MITSUBISHI

70 / 121 page

MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

Fig. 66. Example of Raster Coloring

Fig. 67. CRT Control Register 2

(12) Raster Coloring Function

An entire screen (raster) can be colored by switching each of the R,

G, and B pins to MUTE output. R, G, B are controlled with the CRT

port control register; I is controlled with the CRT control register 2;

OUT is controlled with the character size register. 15 raster colors

can be obtained.

If the OUT 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, 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 66, 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 66.

“RED”

“BLUE”

HSYNC

OUT

Signals

across

A – A'

b7 b6 b5 b4 b3 b2 b1 b0

CRT control register 2 (CBR) [Address 0208 16]

Name

Functions

After reset

R W

CRT Control Register 2

I signal output switch bit

(CBR0)

0: I signal output

1: MUTE signal output

I/TIM1 function switch bit

(CBR1)

Nothing is assigned. These bits are write disable bits.

When these bits are read out, the values are indeterminate.

R—

0: I output or MUTE output

1: 1/2 clock ouput of timer 1

M37207M8-059SP Datasheet(PDF) 70 Page - Mitsubishi Electric Semiconductor

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