參數(shù)資料
型號(hào)： M37560MF
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 40/65頁(yè)
文件大小： 955K
代理商： M37560MF
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
40
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
. (However, when using a 1/2 bias, connect V
L1
and V
L2
and
apply voltage by external resistor division.)
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.
”
4. Set the voltage multiplier control bit (bit 4) of the LCD mode
register to
“
1.
”
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.
When using the voltage multiplier, apply 1.3 V
≤
Voltage
≤
2.1 V to
the V
L1
pin.
When not using the voltage multiplier,apply proper voltage to the
LCD power input pins (V
L1
–
V
L3
). Then set the LCD output enable
bit to
“
1.
”
When the LCD output enable bit is set to
“
0,
”
the V
CC
voltage is
applied to the V
L3
pin inside of this microcomputer.
The voltage multiplier control bit (bit 4 of the LCD mode register)
controls the voltage multiplier.
Fig. 41 Example of circuit at each bias
Table 10. 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.
V
L
3
V
L
2
C
2
C
1
V
L
1
1
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L
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L
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O
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R
2
R
1
R
3
R
1
=
R
2
=
R
3
C
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t
r
a
s
t
c
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t
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o
l
V
L
3
V
L
2
C
2
C
1
V
L
1
1
/
2
b
i
a
s
O
p
e
n
O
p
e
n
R
4
R
5
R4=R5
C
o
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t
r
a
s
t
c
o
n
t
r
o
l
PXx
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 10 according to the bias value.
Select a bias value by the bias control bit (bit 2 of the LCD mode
register).
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