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

(3-1) Description of each instructions

(a) Maker Test

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

Code 0 0 0 0 0 0 0 0 0 0

(b) Clear Display

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

Code 0 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, then

the DD RAM (00)H is set into address counter and I/D of entry mode is set as increment mode. If the cursor

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

In addition, S of entry mode is not changes and contents of MK RAM and CG RAM are also not changed.

Note : The character code (20)H must be blank code in the user defined character pattern (Custom font).

(c) Return Home

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

Code 0 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 (00)H is set into the address counter. Display is

returned to its original position if shifted, the cursor or blink are returned to the left end of the 1st line on

the LCD if the cursor or blink are operating. The DD RAM contents do not change.

(d) Entry Mode Set

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

Code 0 0 0 0 0 0 0 1 I/D S

Entry Mode Set instruction which sets the cursor moving direction and display shift On/Off, is executed

when the code "1" is written into DB2 and codes of (I/D) and (S) are written into DB1 (I/D) and DB0 (S).

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

writing.

I/D

Function

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

read/write operation, and the cursor or blink moves to the right.

0 Address decrement : The address of the DD RAM or CG RAM decrement (-1) when the

read/write operation, and the cursor or blink moves to the left.

S

Function

Entire display shift.

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

1 the I/D=0. The shift is operated only for the character, so that it looks as if the cursor

stands still and display moves.

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

CG RAM.

0 The display does not shift.

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