ST7577 datasheet(8/48 Pages) SITRONIX

8 / 48 page

ST7577

Ver 1.0a

8/48

2008/02/14

6. PIN DESCRIPTION

Pin Name

I/O

Description

Count

LCD DRIVER OUTPUTS

SEG0

…SEG131

LCD segment driver outputs.

This display data and the M signal control the output voltage of segment

driver.

Segment drover output voltage

Display data

Frame

Normal display

Reverse display

VSS

Power save mode

VSS

132

COM0

…COM38

LCD column driver outputs.

This internal scanning data and M signal control the output voltage of

common driver.

Common drover output voltage

Display data

Frame

Normal display

Reverse display

XV0

Power save mode

VSS

MICROPROCESSOR INTERFACE

PS0

…PS2

Microprocessor interface select input pin.

PS2

PS1

PS0

State

“L”

4 Pin-SPI MPU interface

“H”

“L”

3 Pin-SPI MPU interface

“L”

“H”

“L”

8080-series parallel MPU interface

“H”

“L”

6800-series parallel MPU interface

CSB_A

(for Port-A)

CSB_B

(for Port-B)

Chip select input pins.

Data/instruction I/O is enabled only when CSB is

“L”. When chip select is

non-active, D0 to D7 is high impedance.

* MODE pin will select one of two CSB pins. The unused one should be

left floating.

RESB

Reset input pin.

When RESB is

“L”, initialization is executed.

A0_A

(for Port-A)

A0_B

(for Port-B)

It determines whether the data bits are data or a command.

A0=

“H”: Indicates that D0 to D7 are display data.

A0=

“L”: Indicates that D0 to D7 are control data.

When in 3-line SPI interface, left it connected to VDD.

* MODE pin will select one of two A0 pins. The unused one should be left

floating.

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