MITSUBISHI MICROCOMPUTERS
M35072-XXXFP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
(2) To set display frequency range
Whenever setting display frequency (when EXCK1 = "1",
EXCK0 = "1"), always set the display frequency range in
accordance with the display frequency. This range is set from
DIVS0, DIVS1 (address 12016), RSEL0 address 12116) and
RSEL1 (address 12216). Frequency ranges are given here
below.
RSEL1
1
0
1
0
1
0
0
1
0
RSEL0 DIVS1
0
0
1
0
0
0
0
0
0
1
0
0
1
1
0
1
0
1
DIVS0 Display frequency range (MHz)
0
67.0 to 80.0
0
54.0 to 67.0
1
47.0 to 54.0
0
40.0 to 47.0
0
34.0 to 40.0
1
30.0 to 34.0
0
26.0 to 30.0
1
23.0 to 26.0
0
20.0 to 23.0
(3) Notes on setting display frequency
To change external clock (display) frequency or horizontal
synchronization frequency, always use the following
procedures.
(a) Turn the display OFF. … DSPON (address 12816) = "0"
(b) Set the display frequency. … Set from DIV10 to DIV0,
DIVS0, DIVS1 (address 12016), RSEL0 (address 12116) and
RSEL1 (address 12216).
(c) Wait 20 ms while the horizontal synchronization signal and
external clock are being input.
(d) Turn the display ON. … DSPON (address 12816) = "1"
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