NJU6543 Preliminary
! FUNCTION DESCRIPTION
(1) Block Function
• Oscillator
The oscillator includes an external capacitor and an resistor.
When use external clock, input the clock signal to OSC.
It generates clock signal for LCD driving.
• Decoder
Input serial data is decoded and sent to the appropriate block.
• Command Register
Command data is written to this 8 bits command register to control NJU6543 operation.
• Display Data Register
Data is written to this 8 bits register as display data.
• Latch Circuit
Data stored in display data register is assigned to the corresponding SEG/port.
• Segment Driver/General Purpose Ports
Basing on display data, segment drivers output LCD SEG driving signal.
And, SEG125/P1 ~ SEG128/P4 terminals can be selected as segment driver output or general-purpose ports
by instruction.
• Common Driver
Common drivers output LCD COM driving signal.
• Power On Reset
When power is on, NJU6543 is automatically initialized. And if RSTb=”L”, NJU6543 is reset too.
• Electrical Variable Resistance (E.V.R.)
The Electrical Variable Resistance adjusts LCD Driving Voltage from V1 to V3.
-4-
Ver.2008-11-28