M37210M3 Datasheet, PDF (31/59 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M37210M3-XXXSP/FP, M37210M4-XXXSP, M37211M2-XXXSP
M37210E4-XXXSP/FP, M37210E4SP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
(5) Color Registers
The color of a displayed character can be specified by setting the
color to one of the four color registers (CO0 to CO3 : addresses
00E616 to 00E916) and then specifying that color register with the
CRT display RAM.
There are three color outputs : R, G and B. By using a combination
of these outputs, it is possible to set 2³-1 (when no output) = 7 col-
ors. However, because only four color registers are available, up to
four colors can be displayed at one time.
R, G and B outputs are set by using bits 1 to 3 in the color register.
Bit 5 is used to specify whether a character output or blank output.
Figure 29 shows the structure of the color register.
7
0
Color registers 0,1,2,3
(CO0 : address 00E616)
(CO1 : address 00E716)
(CO2 : address 00E816)
(CO3 : address 00E916)
B signal output selection bit
0 : No character is output
1 : Character is output
G signal output selection bit
0 : No character is output
1 : Character is output
R signal output selection bit
0 : No character is output
1 : Character is output
OUT signal output selection bit (Note)
0 : OUT pin outputs character
1 : OUT pin outputs blank
Note : When the character bordering function is used, the contents
of this bit (bit 5) are invalied, and the OUT pin output be-
comes a border output.
Fig. 29 Structure of color registers
(6) Multiline Display
The M37210M3-XXXSP can normally display two lines on the CRT
screen by displaying two blocks at different vertical positions.
In addition, it allows up to 16 lines to be displayed by using a CRT
interrupt.
The CRT interrupt works in such a way that when display of one
block is terminated, an interrupt request is generated.
In other words, character display for a certain block is initiated when
the scanning line reaches the display position for that block (speci-
fied with vertical position register) and when the range of that block
is exceeded, an interrupt is applied.
Note : A CRT interrupt does occurs at the end of display regardless
of display on or off. In other words, even if a block is set to off
display with the display control bit of the CRT control register
(address 00EA16), a CRT interrupt request occurs (refer to
Figure 30).
31