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参数资料
| 型号： | M38267E8GP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100 |
| 文件页数： | 42/82页 |
| 文件大小： | 1377K |
| 代理商： | M38267E8GP |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3826 Group
44
Voltage Multiplier (3 Times)
The voltage multiplier performs threefold boosting. This circuit in-
puts a reference voltage for boosting from LCD power input pin
VL1. (However, when using a 1/2 bias, connect VL1 and VL2 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 VL1 pin during operating the voltage
multiplier, voltage that is twice as large as VL1 occurs at the VL2
pin, and voltage that is three times as large as VL1 occurs at the
VL3 pin.
When using the voltage multiplier, apply 1.3 V
≤ Voltage ≤ 2.3 V
(1.3 V
≤ Voltage ≤ 2.1 V for low voltage version) to the VL1 pin.
When not using the voltage multiplier,apply proper voltage to the
LCD power input pins (VL1–VL3). Then set the LCD output enable
bit to “1.”
When the LCD output enable bit is set to “0,” the VCC voltage is
applied to the VL3 pin inside of this microcomputer.
The voltage multiplier control bit (bit 4 of the LCD mode register)
controls the voltage multiplier.
Fig. 44 Example of circuit at each bias
Table 13. Bias control and applied voltage to VL1–VL3
Bias value
1/3 bias
1/2 bias
Voltage value
VL3=VLCD
VL2=2/3 VLCD
VL1=1/3 VLCD
VL3=VLCD
VL2=VL1=1/2 VLCD
Note : VLCD 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 (VL1–VL3), apply the voltage shown
in Table 13 according to the bias value.
Select a bias value by the bias control bit (bit 2 of the LCD mode
register).
VL3
VL2
C2
C1
VL1
1/3 bias
when using the voltage multiplier
VL3
VL2
C2
C1
VL1
1/3 bias
when not using the voltage multiplier
Open
R2
R1
R3
R1=R2=R3
Contrast control
VL3
VL2
C2
C1
VL1
1/2 bias
Open
R4
R5
R4=R5
Contrast control
PXx
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