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7220 Group User’s Manual

2.11 CRT display function

Table 2.11.1 shows the outline the CRT display function of the M37221M6-XXXSP/FP.

M37220M3-XXXSP/FP

Refer to “CHAPTER 4. M37220M3-XXXSP/FP.”

The M37221M6-XXXSP/FP has the 24 characters ! 2 lines CRT display circuit. CRT display is controlled

by the CRT control register.

Up to 256 kinds of characters can be displayed, and colors can be specified for each character. Up to 4

kinds of colors can be displayed on 1 screen. A combination of up to 7 colors can be obtained by using each

output signal (R, G, and B). Characters are displayed in a 12 ! 16 dot structure to display smooth character

patterns (refer to “Figure 2.11.1”).

How to display characters on the CRT screen is described below.

Write the display character code in the display RAM.

Specify the display color by the color register.

Write the color register in which the display color is set in the display RAM.

Specify the vertical position by the vertical position register.

Specify the character size by the character size register.

Specify the horizontal position by the horizontal position register.

Write the display control bit to the designated block display flag of the CRT control register. When this

is done, the CRT starts according to the input of the VSYNC signal.

The CRT display circuit has an extended display mode. This mode allows multi-line (more than 3 lines) to

be displayed on the screen by interrupting each time 1 line is displayed and rewriting data in the block which

display is terminated by software.

Figure 2.11.2 shows the CRT display circuit block diagram. Figure 2.11.3 shows the CRT control register.

Fig. 2.11.1 Structure of CRT display character

Table 2.11.1 Outline of CRT display function

Performance

24 characters ! 2 lines

12 dots ! 16 dots

(Refer to “Figure 2.11.1”)

256 kinds

3 kinds

1 screen; 4 kinds, maximum 7 kinds

A character

Possible (multi-line display)

Possible (maximum 7 kinds)

Possible (a character unit, 1

screen; 4 kinds, maximum 7 kinds)

Kinds of character

Kinds of character sizes

Parameter

Number of display

character

Dot structure

Color

Display extension

Raster coloring

Character background

coloring

Kind of colors

Coloring unit

12 dots

16 dots

FUNCTIONAL DESCRIPTION

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