ST7070 datasheet(7/51 Pages) SITRONIX

7 / 51 page

ST7070

V1.4

7/51

2009/04/29

Pin Function

Name

Number

I/O

Interfaced

with

Function

MPU

Select registers.

0: Write Instruction or “Read Busy Flag and Address”

1: Data write/read

It is not used in 3-Line SPI interface, fix RS at low, not floating.

R/W

MPU

Select read or write.

0: Write 1: Read

When serial interface select ,R/W pull low, not floating.

MPU

Starts data read/write.

When serial interface select ,E pull height , not floating.

XRESET

MPU

Hardware reset pin, Low active

PSB

MPU

Parallel /Serial selection. PSB: ”1”

Parallel , “0”

Serial.

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 ST7070.

DB7 can be used as a busy flag.

Serial:

DB7:data input pin for serial mode(SI)

DB6:serial clock input for serial mode(SCL)

DB5:chip select pin for serial mode(/CS)

When serial interface select ,D4 pull height , not floating.

4bits mode : These pins are used during 4-bit operation.

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 ST7070.

These pins are not used during 4-bit operation and serial

interface , must pull height , not floating.

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

SEG80

LCD

Segment signals

V0 to V4

Power supply

Power supply for LCD drive

V0 － Vss = 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. V0 >= V1 >= V2 >= V3 >= V4 >= Vss must be maintained

2. Two clock options:

OSC1

OSC2

Clock input

R=91K (Vcc=5V)

R=75K (Vcc=3V)

OSC1

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