LH155BA datasheet(5/51 Pages) SHARP

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LH155BA

1.3. System Bus Pins

SYMBOL

I/O

DESCRIPTION

CSB

Chip selection input pin that decoded address bus signal is input.

Distinguishes display RAM data/commands of D7 to D0 data transferred from MPU.

0 : The data of D7 to D0 show the display RAM data.

1 : The data of D7 to D0 show the command data.

RDB

(E)

• In connecting to 80-family MPU :

This RDB is a pin for connecting the RDB signal of 80-family MPU. When the

signal enters in the "L" state, the data bus of this IC turns to the "output" state.

• In connecting to 68-family MPU :

This RDB becomes a pin for connecting the enable clock signal of 68-family MPU.

When the signal enters in the "H" state, the data bus of this IC turns to the "active"

state.

WRB

(R/W)

• In connecting to 80-family MPU :

This WRB is a pin for connecting the WRB signal of 80-family MPU, and when

WRB signal is "L", this pin is "active".

The data bus signal is input at the rising edge of WRB signal.

• In connecting to 68-family MPU :

This WRB becomes a pin for connecting the R/W signal of controlling read/write of

68-family MPU.

R/W = "H" : Read

R/W = "L" : Write

M86

MPU interface-type shift pin.

M86 = "H" : 68-family interface

M86 = "L" : 80-family interface

Fixed to either "H" or "L".

SDA

Serial-data input pin at time of serial interface selection.

SCL

Serial clock pin at time of serial interface selection.

Used to shift the SDA data by using the rising edge of SCL.

Used to convert into 8-bit data by using the 8th clock at the rising edge of SCL in

serial-to-parallel data processing.

After data-transferring, or when making no access, be sure to set to "L".

8-bit bi-directional data bus, connected to 8-bit MPU data bus.

I/O

D7-D0

Initialized by setting to "L". The reset signals of the system are normally input. Reset

operation is performed in accordance with RESB signal level.

RESB

Used to shift between parallel interface and serial interface.

P/S = "H" for parallel input. Fix SDA and SCL pins to either "H" or "L".

P/S = "L" for serial input. Fix D7 to D0 pins to High-Z, RDB and WRB pins to either

"H" or "L".

P/S

TEST

For testing. Fix to "L".

P/S Chip selection Data identification

Data

Read/Write Serial clock

CSB

D7-D0

RDB, WRB

–

CSB

SDA

Write only

SCL

LH155BA Datasheet(PDF) 5 Page - Sharp Corporation

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