MITSUBISHI MICROCOMPUTERS
M37207MF-XXXSP/FP, M37207M8-XXXSP
M37207EFSP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
and ON-SCREEN DISPLAY CONTROLLER
46
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
register.
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
