M35074 Datasheet, PDF (18/44 Pages) Renesas Technology Corp – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35074-XXXSP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
(2) To set display frequency range
Whenever setting display frequency (when EXCK1 = "0",
EXCK0 = "1", or EXCK1 = "1", EXCK0 = "1"), always set the
display frequency range in accordance with the display
frequency. This range is set from DIVS0, DIVS1, DIVS2,
RSEL0 and RSEL1 (address 12016). Frequency ranges are
given here below.
RSEL1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
RSEL0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
DIVS2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
DIVS1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
DIVS0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
Display frequency range MHz
112.0 to 120.0
104.0 to 112.0
93.0 to 104.0
80.0 to 93.0
75.0 to 80.0
69.5 to 75.0
62.0 to 69.5
55.0 to 62.0
—
52.0 to 55.0
46.5 to 52.0
40.0 to 46.5
37.5 to 40.0
35.0 to 37.5
31.0 to 35.0
27.5 to 31.0
—
26.0 to 27.5
23.5 to 26.0
20.0 to 23.5
(3) Notes on setting display frequency
To change external clock (display) frequency or horizontal syn-
chronization frequency, always use the following procedures.
To set EXCK1 = "0", EXCK0 = "1"
(a) Turn the display OFF. … DSPON (address 12716) = "0"
(b) Set the display frequency. … Set from DIV11 to
DIV0, DIVS0, DIVS1, DIVS2, RSEL0 and RSEL1 (ad-
dress 12016).
(c) Wait 20 ms while the horizontal synchronization signal is
being input.
(d) Turn the display ON. … DSPON (address 12716) = "1"
To set EXCK1 = "1", EXCK0 = "1"
(a) Turn the display OFF. … DSPON (address 12716) = "0"
(b) Set the display frequency. … Set from DIV11 to DIV0,
DIVS0, DIVS1, DIVS2, RSEL0 and RSEL1 (address
12016).
(c) Wait 20 ms while the horizontal synchronization signal
and external clock are being input.
(d) Turn the display ON. … DSPON (address 12716) = "1"
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