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Table 7

Instruction set with parallel bus commands; note 1

INSTRUCTION

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

DESCRIPTION

REQUIRED

CLOCK

CYCLES

H=0or1

NOP

0000000000

no operation

3

Function set

00001

DL

0

M

0

H

sets interface Data Length (DL) and number of

display lines (M); extended instruction set control

(H)

3

Read busy flag

and address

counter

0

1

BF

AC

reads the Busy Flag (BF) indicating internal

operating is being performed and reads address

counter contents

0

Read data

1

1

read data

reads data from CGRAM or DDRAM

3

Write data

1

0

write data

writes data from CGRAM or DDRAM

3

H=0

Clear display

0000000001

clears entire display and sets DDRAM address 0

in address counter

165

Return home

0000000010

sets DDRAM address 0 in address counter; also

returns shifted display to original position; DDRAM

contents remain unchanged

3

Entry mode set

00000001

I/D

S

sets cursor move direction and specifies shift of

display; these operations are performed during

data write and read

3

Display control

0000001

D

C

B

sets entire display on/off (D), cursor on/off (C) and

blink of cursor position character (B); D = 0

(display off) puts chip into power-down mode

3

Cursor/display

shift

000001

S/C

R/L

00

moves cursor and shifts display without changing

DDRAM contents

3

Set CGRAM

address

0001

sets CGRAM address; bit 6 is to be set by the

command ‘set DDRAM address’; look at the

description of the commands

3

Set DDRAM

address

001

sets DDRAM address

3