Crt Display Function; Fig. 2.11.1 Structure Of Crt Display Character; Table 2.11.1 Outline Of Crt Display Function - Renesas 7200 Series User 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
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
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 V
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

12 dots
16 dots
7220 Group User's Manual
FUNCTIONAL DESCRIPTION
2 lines CRT display circuit. CRT display is controlled
16 dot structure to display smooth character
signal.
SYNC

Table 2.11.1 Outline of CRT display function

Parameter
Number of display
character
Dot structure
Kinds of character
Kinds of character sizes
Kind of colors
Color
Coloring unit
Display extension
Raster coloring
Character background
coloring
2.11 CRT display function
Performance
24 characters
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)
2 lines
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