M37207M8-059SP datasheet(46/121 Pages) MITSUBISHI

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MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

CRT DISPLAY FUNCTIONS

(1) Outline of CRT Display Functions

Table 6 outlines the CRT display functions of this microcomputer.

This microcomputer incorporates a CRT display circuit of 24 charac-

ters ! 3 lines. CRT display is controlled by the CRT control register.

Up to 256 kinds of characters can be displayed. The colors can be

specified for each character and up to 4 kinds of colors can be dis-

played on one screen. A combination of up to 15 colors can be ob-

tained by using each output signal (R, G, B and I).

Characters are displayed in a 12 !16 dots configuration to obtain

smooth character patterns (refer to Figure 43).

The following shows the procedure how to display characters on the

CRT screen.

Write the display character code in the display RAM.

Specify the display color by using the color register.

Write the color register in which the display color is set in the dis-

play RAM.

Specify the vertical position by using the vertical position register.

Specify the character size by using the character size register.

Specify the horizontal position by using the horizontal position

Write the display enable bit to the designated block display flag of

the CRT control register 1. When this is done, the CRT display

starts according to the input of the VSYNC signal.

The CRT display circuit has an extended display mode. This mode

allows multiple lines (4 lines or more) to be displayed on the screen

by interrupting the display each time one line is displayed and rewrit-

ing data in the block for which display is terminated by software.

Figure 44 shows the CRT display control register 1. Figure 45 shows

the block diagram of the CRT display circuit.

Table 6. Outline of CRT Display Functions

Parameter

Number of display

characters

Character display area

Kinds of characters

Kinds of character sizes

Color

Display expansion

Raster coloring

Character background

coloring

Functions

24 characters ! 3 lines

12 ! 16 dots (refer to Figure 43)

256 kinds

4 kinds

1 screen : 4 kinds, maximum 15 kinds

A character

Possible (multiline display)

Possible (maximum 15 kinds)

Possible (a character unit, 1 screen :

4 kinds, maximum 7 kinds)

Kinds of colors

Coloring unit

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