m35046 Renesas Electronics Corporation., m35046 Datasheet - Page 16

• Manufacturer Part Number: m35046
• Description: Screen Character And Pattern Display Controllers
• Manufacturer: Renesas Electronics Corporation.

(2) Setting display frequencies
Cautions in setting a display frequency
To change the external clock frequency or the horizontal synchroni-
zation frequency, follow the steps in sequence given below.
(a) Display OFF
(b) Set the display frequency
(c) 20-ms waiting time with the horizontal synchronization signal and
(d) Display ON
RSEL1
Set a display frequency by setting a frequency value for the hori-
zontal synchronization signal by use of DIV10 to DIV0 (120
Set display frequency area in conformity with the frequency of the
external clock signal.
Set display frequency area by use of DIVS0, DIVS1 (120
RSEL0 (121
lows.
the external clock signal being input
0
0
1
0
0
1
0
0
1
0
0
RSEL0
1
0
0
1
0
0
1
0
0
1
0
16
), and RSEL1 (122
DIVS1
0
0
0
0
0
1
1
1
1
1
1
DIVS0
(DSPON = 0)
(Use DIV10 to DIV0 (120
DIVS0, DIVS1 (120
(121
(DSPON = 1)
0
0
1
1
1
0
0
0
1
1
1
16
16
). Frequency area are as fol-
), and RSEL1 (122
Display frequency area
70.0 to 80.0
63.0 to 70.0
56.6 to 63.0
46.6 to 56.6
45.0 to 46.6
42.5 to 45.0
35.0 to 42.5
31.5 to 35.0
28.3 to 31.5
23.3 to 28.3
20.0 to 23.3
16
), RSEL0
16
).)
16
16
).
16
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
),
),
MITSUBISHI MICROCOMPUTERS
M35046-XXXSP/FP
15