Preliminary NJU6543
(4) Command Register2
• Command Register2 is used to set the oscillator, driving waveform, and E.V.R. resister set. When the D7 to D6
bits of the 1st word are (1,1), the D5 ~ D0 bits are recognized as command data.
The contents of Command Register will be initialized as following when applying Power On Reset or Reset.
The Default Value of Command Register
• Oscillator selection
• Driving waveform
• E.V.R. Register Set
• Display
: External resistor and capacitor
: A(Time sharing system frequency) waveform
: V0(0,0,0)
:OFF
D7
D6
D5
D4
D3
D2
D1
D0
1
0
EXOSC WSEL
E2
E1
E0
SC
Flag bits
• Oscillator selection
EXOSC
0
1
Oscillator Driving
E.V.R. register set
selection wave form
Oscillator circuit
External resistor and capacitor
External oscillation signal input
Display
• Driving waveform
WSEL
Driving waveform
0
A(Time sharing system frequency) waveform
1
B(Flame reversal) waveform
Driving waveform is chosen according to the characteristic of a panel.
• E.V.R. resister set
E.V.R. resistor set instruction adjusts the contrast of the LCD, by 3-bits selects(E2,E1,E0).
One LCD driving voltage VLCD out of 8 voltage-stages by setting E.V.R. register.
Set the binary code “000” when contrast adjustment is unused.
E2 E1 E0
V1
1/2bias
1/3bias
VLCD (V0~VSS )
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
V0
0.933V 0
0.875V 0
0.824V 0
0.778V 0
0.737V 0
0.700V 0
0.667V 0
V0
0.955V 0
0.913V 0
0.875V 0
0.840V 0
0.808V 0
0.778V 0
0.750V 0
High
:
:
:
:
:
:
Low
Ver.2008-11-28
-7-