M30222 Datasheet, PDF (149/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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Specifications in this manual are tentative and subject to change
MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
LCD Drive Control Circuit
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
LCD expansion register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
LEXP
Address
013016
When reset
0016
Bit symbol
Bit name
LEXPEN
LCD Expansion enable bit
LCKPOL
LCD clock out and polarity select bit
LSYNC
LCD SYNCout initiation bit
Function
0 : Disable
1 : Enable
0 : SOF at rising edge
1 : SOF at falling edge
0 : No action
1 : Initiate SYNC
Nothing is assigned.
These bits can neither be set nor reset. When read, the value is indeterminate.
LSTATCNF0
LCD static drive pin configuration
LSTATCNF1 ^{select bits}
LSTATEN LCD static drive enable bit
0 0 : SEG35 to SEG24 static
0 1 : SEG35 to SEG27 static
1 0 : SEG35 to SEG32 static
1 1 : Do not use
0 : Disable
1 : Enable
RW
LCD clock divide counter
b7
b0
Symbol
LCDC
Function
8 bit timer
Address
013216
When reset
Indeterminate
Values that can be set
0016 to FF16
Fig. 1.119. LCD expansion related register (2)
RW
X
Voltage Multiplier
The voltage multiplier performs threefold boosting. This circuit inputs a reference voltage for boosting from LCD
power input pin VL1. (However, when using a 1/2 bias, supply power to the VL1 and VL2 through an external resistor
divider.)
To activate the voltage multiplier, choose the segment/port and duty rate, select bias control, and set up the LCD
frame frequency counter and LCDCK count source using the segment enable register and LCD mode register,
then enable the LCD output enable bit (bit 7 at address 012216) and set the voltage multiplier control bit (bit 4 at
address 012016) to “1” (= voltage multiplier enabled). 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.
The voltage multiplier control bit (bit 4 of the address 012016) controls the voltage multiplier. When using the voltage
multiplier, apply a voltage equal to or greater than 1.3 V but not exceeding 2.1 V to the VL1 pin before enabling the
voltage multiplier control bit.
When not using the voltage multiplier, enable the LCD output enable bit and apply an appropriate voltage to the
LCD power supply input pins (VL1 to VL3). When the LCD output enable bit is disabled, the VL3 pin is connected to
VCC internally.
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