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

(3-1)Description of instruction

a) Maker Test

RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Code 0

0

0

0

0

0

0

0

0

All “0” code is using device testing mode ( only for maker ).

b) Clear Display

RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Code 0

0

0

0

0

0

0

0

1

Clear display instruction is executed when the code “1” is written into DB0.

when this instruction is executed, the space code (20)H is written into every DD RAM address, the

DD RAM address 0 is set into the address counter and entry mode is set an increment. If the

cursor or blink are displayed, they are returned to the left end of the 1st line on the LCD.

The S of entry mode and CG RAM data does not change.

Note: The character pattern for character code (20)H must be blank code in the user-defined

character pattern( Custom font ).

c) Return Home

RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Code 0

0

0

0

0

0

0

1

∗

∗=Don’t Care

Return home instruction is executed when the code “1” is written Into DB1. When this Instruction

is executed, the DD RAM address 0 is set to address counter. Display is returned to the original

position if shifted, the cursor or blink is returned to the left end of the LCD. If the cursor or blink are

on the display, the DD RAM contents are not changed.

d) Entry Mode Set

RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Code 0

0

0

0

0

0

1 I/D S

Entry mode set instruction which sets cursor moving direction and display shift On/Off, is executed

when the code “1” is written into DB2 and the codes of (I/D) and (S) are written into DB1 (I/D) and

DB0 (S) as shown below.

(I/D) sets the address increment or decrement, and the (S) sets the entire display shift in the DD

RAM writing.

I/D

FUNCTION

1

Address increment : The address of the DD RAM increment ( +1) when

the write, and the cursor or blink moves to the right.

0

Address decrement : The address of the DD or CG RAM decrement

( -1) when the write, and the cursor or blink move to the left.

S

FUNCTION

1

Entire display shift.

The shift direction is determined by I/D: shift to the left at I/D=1 and shift

to the right at the I/D=0. The shift is operated with only the character, so

that it looks as if the cursor stands still and the display moves. The

display does not shift when reading from the DD RAM and writing into

CG RAM.

0

The display does not shifting

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