NJU6637 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU6637

16-CHARACTER 3-LINE DOT MATRIX LCD CONTROLLER DRIVER

Japan Radio Corporation  

Preliminary

NJU6637

(3)Instructions

The NJU6637 incorporates two resisters, which are Instruction Register (IR) and a Data Register (DR).

These two registers store control information temporarily to allow interface between NJU6637 and MPU or

peripheral ICs operating different cycles. The operation of NJU6637 is determined by this control signal

from MPU. The control information includes register selection signals (RS) and data bus signals (DB0 to

DB7). Table 5. Shows each instruction and its operating time.

Note) The execution time mentioned in Table 5. is based on fcp or fOSC=145kHz.

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

INSTRUCTION

Maker Test

Clear Display

Return Home

Entry Mode Set

Display ON/OFF

Control

Cursor or Display

Shift

Set RAM Address

Write Data to

CG or DD RAM

Explanation of

Abbreviation

*:Don't care

Table 5. Table of Instruction

CODE

RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

DESCRIPTION

EXEC TIME

(fOSC=145kHz)*

0

0

0

0

0

0

0

0

0

All “0” code is using for maker

testing.

–

0

0

0

0

0

0

0

0

1

Display clear and sets DD RAM

address 0 in AC.

2ms

Sets DD RAM address 00H In AC

and returns display being shifted to

0 0 0 0 0 0 0 1 ∗ original position.

0µs

DD RAM contents remain

unchanged.

Sets cursor move direction and

species shift of display are

0

0

0

0

0

0

1

I/D S

performed In data write.

I/D=1:Increment,

0µs

I/D=D:Decrement,

S=1:Accopanies display shift.

Sets of display On/Off(D), cursor

0 0 0 0 0 1 D C B On/Off(C) and blink of cursor

0µs

position character(B)

Move cursor and shifts display

without changing DD RAM

contents.

0 0 0 0 1 S/C R/L ∗ ∗ S/C=1 : Display shift

0µs

S/C=0 : Cursor shift

R/L=1 : Shift to right

R/L=0 : Shift to the left

01

RAM address

Sets RAM address. After this

instruction, the data is transferred

0µs

to RAM.

Write Data(DD RAM)

1

∗∗∗

(CG RAM)

Writes data into CG or DD RAM.

55µs

DD RAM : Display data RAM, CG RAM : Character generator RAM

ACG : CG RAM address, ADD : DD RAM address, Corresponds to cursor address

AC : Address counter used for both DD and CG RAM

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