M35061 Datasheet, PDF (24/40 Pages) Mitsubishi Electric Semiconductor – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35061-XXXSP/FP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
(3) Compounding character ROM and SYRAM
You can compound characters in character ROM with SYRAM.
The compounding method is determined by the SYEX color ex-
pansion bit and the HIDE register (address 2AA16).
For dot lines where SYEX = 0, the SYRAM color is set by the dis-
play RAM’s SR, SG, and SB irrespective of the HIDE register’s
content.
If the HIDE register’s content is 0, the SYRAM color for dot lines
where SYEX = 1 is set by the LINER, LINEG, and LINEB regis-
ters (address 2AC16).
If the HIDE register’s content is 1, the character ROM part of the
dot lines where SYEX = 1 is overwritten in HIDE mode with colors
set by the LINER, LINEG, and LINEB registers irrespective of the
ROM’s content and color. The color of the SYRAM part is set by
the display RAM’s SR, SG, and SB as in the case of dot lines
where SYEX = 0.
Figure 10 shows an example for each instance of compounding.
Character ROM
SYRAM
Compounding
Contents of
register HIDE
Ex. 1
SYEX
0
0
0
0
0
0
0
0
0
0
0
0
0
0 (normal mode)
SR,
SG,
SB
SYEX
0
0
0
0
0
0
0
0
0
0
0
0
0
1 (HIDE mode)
Ex. 2
SYEX
1
1
1
1
1
0
0
0
0
0
0
0
0
LINER,
LINEG,
LINEB
SR,
SG,
SB
SYEX
1
1
1
1
1
0
0
0
0
0
0
0
0
When HIDE = 1, the character ROM’s contents for dot lines where SYEX = 1 become invisible.
Fig. 10 Compounding example
SR,
SG,
SB
LINER,
LINEG,
LINEB
SR,
SG,
SB
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