參數(shù)資料
型號(hào)： 7560
英文描述： 7560 Group Datasheet Datasheet 1682K/JAN.14.03
中文描述： 7560組數(shù)據(jù)表數(shù)據(jù)表1682K/JAN.14.03
文件頁(yè)數(shù)： 47/90頁(yè)
文件大小： 1682K
代理商： 7560
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
46
Voltage Multiplier (3 Times)
The voltage multiplier performs threefold boosting. This circuit in-
puts a reference voltage for boosting from LCD power input pin
V
L1
.
Set each bit of the segment output enable register and the LCD
mode register in the following order for operating the voltage mul-
tiplier.
1. Set the segment output enable bits (bits 0 to 5) of the seg-
ment output enable register to
“
0
”
or
“
1
”
.
2. Set the duty ratio selection bits (bits 0 and 1), the bias con-
trol bit (bit 2), the LCD circuit divider division ratio selection
bits (bits 5 and 6), and the LCDCK count source selection
bit (bit 7) of the LCD mode register to
“
0
”
or
“
1
”
.
3. Set the LCD output enable bit (bit 6) of the segment output
enable register to
“
1
”
. Apply the limit voltage or less to the
V
L1
pin.
4. Set the voltage multiplier control bit (bit 4) of the LCD mode
register to
“
1
”
. However, be sure to select 1/3 bias for bias
control.
When voltage is input to the V
L1
pin during operating the voltage
multiplier, voltage that is twice as large as V
L1
occurs at the V
L2
pin, and voltage that is three times as large as V
L1
occurs at the
V
L3
pin.
I
Notes on Voltage Multiplier
When using the voltage multiplier, apply the limit voltage or less to
the V
L1
pin, then set the voltage multiplier control bit to
“
1
”
(en-
abled).
When not using the voltage multiplier, set the LCD output enable
bit to
“
1
”
, then apply proper voltage to the LCD power input pins
(V
L1
–
V
L3
).
When the LCD output enable bit is set to
“
0
”
(disabled), the V
CC
voltage is applied to the V
L3
pin inside of this microcomputer.
Fig. 48 Example of circuit at each bias
Table 12 Bias control and applied voltage to V
L1
–
V
L3
Bias value
1/3 bias
1/2 bias
Voltage value
V
L3
=V
LCD
V
L2
=2/3 V
LCD
V
L1
=1/3 V
LCD
V
L3
=V
LCD
V
L2
=V
L1
=1/2 V
LCD
Note :
V
LCD
is the maximum value of supplied voltage for the
LCD panel.
Bias Control and Applied Voltage to LCD
Power Input Pins
To the LCD power input pins (V
L1
–
V
L3
), apply the voltage shown
in Table 12 according to the bias value.
Select a bias value by the bias control bit (bit 2 of the LCD mode
register).
V
L3
V
L
2
C
2
C
1
V
L
1
1
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V
L3
V
L2
C
2
C
1
V
L1
1
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O
p
e
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p
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R
2
R
1
R
3
R1=R2=R3
C
o
n
t
r
a
s
t
c
o
n
t
r
o
l
V
L
3
V
L
2
C
2
C
1
V
L
1
1/2 bias
O
p
e
n
O
p
e
n
R4
R5
R
4
=
R
5
C
o
n
t
r
a
s
t
c
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t
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P
X
x
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