ML9044 datasheet(4/55 Pages) OKI

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ML9044

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PIN DESCRIPTIONS

Symbol

Description

R/W

The input pin with a pull–up resistor to select Read (“H”) or Write (“L”) in the Parallel

I/F Mode.

This pin should be open in the Serial I/F Mode.

RS0, RS1

RS1

RS0

Name of register

Data register

Instruction register

Expansion Instruction register

The input pins with a pull–up resistor– to select a register in the Parallel I/F Mode.

This pin should be open in the Serial I/F Mode.

The input pin for data input/output between the CPU and the ML9044 and for activating

instructions in the Parallel I/F Mode.

This pin should be open in the Serial I/F Mode.

DB0 to DB3

The input/output pins to transfer data of lower–order 4 bits between the CPU and the

ML9044 in the Parallel I/F Mode. Each pin is equipped with a pull–up resistor. These 4

lines are not used for the 4–bit interface.

This pin should be open in the Serial I/F Mode.

DB4 to DB7

The input/output pins to transfer data of upper 4 bits between the CPU and the ML9044

in the Parallel I/F Mode. Each pin is equipped with a pull–up resistor.

This pin should be open in the Serial I/F Mode.

OSC1

OSC2

OSCR

The clock oscillation pins required for LCD drive signals and the operation of the

ML9044 by instructions sent from the CPU.

To input external clock, the OSC1 pin should be used. The OSCR and the OSC2 pins

should be open.

To start oscillation with an external resistor, the resistor should be connected between

the OSC1 and OSC2 pins. The OSCR pin should be open.

To start oscillation with an internal resistor, the OSC2 and OSCR pins should be

short–circuited outside the ML9044. The OSC1 pin should be open.

COM1 to COM17

The LCD common signal output pins.

For 1/9 duty, non–selectable voltage waveforms are output via COM10 to COM17. For

1/12 duty, non–selectable voltage waveforms are output via COM13 to COM17.

SEG1 to SEG120

The LCD segment signal output pins.

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