M35071 Datasheet, PDF (19/40 Pages) Mitsubishi Electric Semiconductor – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35071-XXXSP/FP
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 (address
12016), RSEL0 address 12116) and RSEL1 (address 12216).
Frequency ranges are given here below.
RSEL1
1
1
0
1
0
1
0
0
1
0
RSEL0 DIVS1
1
0
0
0
1
0
0
0
0
0
0
1
0
0
1
1
0
1
0
1
DIVS0 Display frequency range (MHz)
0
87.0 to 90.0
0
67.0 to 87.0
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.
To set EXCK1 = "0", EXCK0 = "1"
(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 is
being input.
(d) Turn the display ON. … DSPON (address 12816) = "1"
To set EXCK1 = "1", EXCK0 = "1"
(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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