PS08128AZS-F datasheet(31/65 Pages) POWERTIP

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ST7066U

V2.0

2001/03/01

8/42

Pin Function

Name

Number

I/O Interfaced with

Function

MPU

Select registers.

0: Instruction register (for write) Busy flag:

address counter (for read)

1: Data register (for write and read)

R/W

MPU

Select read or write.

0: Write

1: Read

MPU

Starts data read/write.

DB4 to DB7

I/O

MPU

Four high order bi-directional tristate data bus

pins. Used for data transfer and receive

between the MPU and the ST7066U. DB7 can

be used as a busy flag.

DB0 to DB3

I/O

MPU

Four low order bi-directional tristate data bus

pins. Used for data transfer and receive

between the MPU and the ST7066U.

These pins are not used during 4-bit operation.

CL1

Extension driver

Clock to latch serial data D sent to the

extension driver

CL2

Extension driver

Clock to shift serial data D

Extension driver

Switch signal for converting the liquid crystal

drive waveform to AC

Extension driver

Character pattern data corresponding to each

segment signal

COM1 to

COM16

LCD

Common signals that are not used are changed

to non-selection waveform. COM9 to COM16

are non-selection waveforms at 1/8 duty factor

and COM12 to COM16 are non-selection

waveforms at 1/11 duty factor.

SEG1 to

SEG40

LCD

Segment signals

V1 to V5

Power supply

Power supply for LCD drive

VCC - V5 = 10 V (Max)

VCC , GND

Power supply

VCC : 2.7V to 5.5V, GND: 0V

OSC1, OSC2

Oscillation

resistor clock

When crystal oscillation is performed, a resistor

must be connected externally. When the pin

input is an external clock, it must be input to OSC1.

Note:

1. Vcc>=V1>=V2>=V3>=V4>=V5 must be maintained

2. Two clock options:

OSC1

OSC2

Clock

input

R=91K

Ω(Vcc=5V)

R=75K

Ω(Vcc=3V)

OSC1

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