NJU6475B Ver la hoja de datos (PDF) - Japan Radio Corporation

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NJU6475B

12-Character 4-Line Dot Matrix Low Power LCD Controller Driver with key Scan Function

Japan Radio Corporation  

NJU6475B

(3) Instruction

The NJU6475B incorporates two registers, an Instruction Register (IR) and a Data Register (DR). These

two registers store control information temporarily to allow interface between NJU6475B and MPU or peripheral

IC operating different cycles. The operation of NJU6475B is determined by this control signal from MPU.

The control information includes resister selection signals (RS), Read / Write signals (R/W) and data signal

(SIO).

Instruction

Maker Test

Clear Display

Return Home

Entry Mode Set

<Table-5> shows each instruction and its operating time

Code

RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

0000000000

Description

All "0" code is using for

maker testing.

Execute Time

(fCP or fOSC(MAX)

=180kHz)

-

0 0 0 0 0 0 0 0 0 1 Clears Display and sets RAM

address (00)H in AC.

5.42ms

Sets RAM address (00)H in AC

0 0 0 0 0 0 0 0 1 * and returns shifted display to

original position. RAM contents

are not changed

sets cursor move direction and

0 0 0 0 0 0 0 1 I/D S display shift operation which are

performed at data read/write.

83.4us

0us

Display ON/OFF

Control

Cursor or

Display Shift

Function Set

Set Display Control

0 0 0 0 0 0 1 D C B On /Off (D), cursor On /Off (C)

0us

and character blinking (B) at

cursor position.

moves cursor and shifts dis- Cursor :

0 0 0 0 0 1 S/C R/L * * play without changing RAM(DR)

83.4us

contents.

Display : 0us

0 0 0 0 1 * * * * PD Sets Interface data length (DL)

and power down mode (PD).

0us

Electronic Volume 0 0 0 1 * * Electronic

Sets Vreg data to EVR control

Register Set

volume register.

0us

RAM Address Set 0 0 1

Address

Key Data Read

01

Read Data (KEY DATA)

Sets RAM Address. After this

instruction, the data is trans-

ferred to/from RAM.

When LCD/Key= "1", reads key

data out.

83.4us

0us

Data Write to CG

or DD or MK RAM

* : Don't care

1

0

Write Data (DD RAM)

***

(CG RAM)

(MK RAM)

I/D=1:Increment, I/D=0:Decrement,

S=1:Include Display Shift,

S/C=1:Shift Display, S/C=0:Cursor

shift, R/L=1:Shift to Right,

R/L=1:Shift left, PD=0:Power Down Mode

PD=1:Cancel Power Down Mode

Writes data into DD or CG or

MK RAM.

DD RAM : Display data RAM

CG RAM : Character generator

RAM

MK RAM : Icon display RAM

AC : Address counter use for

DD, CG and MK RAM

83.4us

When FRQ is

changed, the

execute time is

also changed.

Note : If the oscillation frequency is changed, the execution time is also changed.

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