M35061 Datasheet, PDF (21/40 Pages) Mitsubishi Electric Semiconductor – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35061-XXXSP/FP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
5. Scroll display mode
The scroll display mode is entered by setting registers SBIT0 to 3
(SA), SLIN0 to 4 (SB), SST0 to 4 (SC), and SEND0 to 4 (SD) (all
at address 2AE16). (Scroll is turned off when SD = 0.)
The screen is scrolled in the range from the (SC)’th line to the
(SD-1)’th line, and sections above and below this range are fixed.
The beginning line and beginning dot of scroll are the (SA)’th dot
on the (SB)’th line.
The screen can be scrolled up or down by successively
incrementing or decrementing SA and SB.
Figure 6 shows examples of how the display is scrolled. The scroll
range in these examples contains 12 lines (second to the 13th lines).
However, the screen can display only 11 lines at a time, and the
re-maining one line is handled as a dummy line and not displayed.
Setting example 1
SA = 0
SB = 2
SC = 2
SD = 14
Line number when
on screen display
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Zero line
1st line
< fixed block >
2nd line (0 dot to 12 dots)
3rd
4th line
5th line
6th line
7th line
< Scrolling block >
8th line
9th line
10th line
11th line
12th line (0 dot to 12 dots)
14th line
15th line
16th line
< fixed block >
Dummy line
13th line (0 dot to 12 dots)
Setting example 2
SA = 3
SB = 5
SC = 2
SD = 14
Line number when
on screen display
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Zero line
1st line
< fixed block >
5th line (3 dots to 12 dots)
6th line
7th line
8th line
9th line
10th line
11th line
12th line
13th line
2nd line
3rd line
< Scrolling block >
4th line (0 dot to 2 dots)
14th line
15th line
16th line
< fixed block >
Dummy line
5th line (0 dot to 2 dots)
or
4th line (3 dots to 12 dots)
When displayed in order of SA = 0, 1, 2, and so on, the screen scrolls up. When displayed in order of SA = 12, 11, 10, and so on, the
screen scrolls down.
(1) To scroll the screen up, write the dummy line after you set the 0th dot in SA but before setting the 1st dot.
(2) To scroll the screen down, write the dummy line after you set the 0th dot in SA but before setting the 12th dot of the preceding line.
Fig. 6 Scrolling example
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