GENERAL DESCRIPTION
The NJU6680 is a 128-common x 128-segment 4-level gray scale bit map LCD driver to display graphics or characters.
It contains 32,768-bit display data RAM, microprocessor interface circuits, instruction decoder, and common and segment drivers.

FEATURES
● Direct Correspondence of Display Data RAM to LCD Pixel
● Display Method – 4-level Gray Scale / Black & White
● Display Data RAM – 32,768 bits ;( 128-Com x 128-Seg) x 2bit
● LCD drivers – 128-common and 128-segment
● Direct connection to 8-bit Microprocessor interface for both of 68 and 80 type MPU
● Serial Interface (SI, SCL, RS, CS)
● Partial Display Function
● Easy Vertical Scroll by setting the start line address of over size display data RAM
● Programmable Bias ratio selection ; 1/5, 1/6, 1/7, 1/8, 1/9, 1/10, 1/11, 1/12 bias
● Useful Instruction Sets
    Status read, Display data write, Column address set, Page address set, Initial display line set, Initial COM0 line set, Display ON/OFF, Entire display ON/OFF, Reverse display ON/OFF, N-line inversion set, N-line inversion OFF, ADC select, COM scan direction select, Internal resistor ratio set, Power control set, Partial display duty set, LCD bias set, Boost level set, Contrast level set, Power save mode ON, Power save mode OFF, Internal oscillator ON, Display data length set, Reset, FRC & PWM set, Grey scale mode set Display mode set.
● Power Supply Circuit for LCD; Programmable Booster Circuits (6 times maximum, Voltage boosting polarity : Positive Voltage (VSS Common), Voltage Regulator, Voltage Follower (x 4))
● Precision Electrical Variable Resistance (64 Step)
● Low Operating Current IOUT1=400µA (TYP.)
● Operating Voltage 2.2 to 3.6 V
● LCD Driving Voltage 6.0 to 18.0V
● Package Outline Bumped Chip
● C-MOS Technology ( Substrate : P )