PC0801ARS-F datasheet(40/65 Pages) POWERTIP

40 / 65 page

ST7066U

V2.0

2001/03/01

17/42

Instructions

There are four categories of instructions that:

#" Designate ST7066U functions, such as display format, data length, etc.

#" Set internal RAM addresses

#" Perform data transfer with internal RAM

#" Others

Instruction Table:

Instruction Code

Instruction

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Description

Time

(270KHz)

Clear

Display

Write "20H" to DDRAM. and

set DDRAM address to

"00H" from AC

1.52 ms

Return

Home

Set DDRAM address to

"00H" from AC and return

cursor to its original position

if shifted. The contents of

DDRAM are not changed.

1.52 ms

Entry Mode

Set

I/D

Sets cursor move direction

and specifies display shift.

These operations are

performed during data write

and read.

37 us

Display

ON/OFF

D=1:entire display on

C=1:cursor on

B=1:cursor position on

37 us

Cursor or

Display

Shift

S/C

R/L

Set cursor moving and

display shift control bit, and

the direction, without

changing DDRAM data.

37 us

Function

Set

DL:interface data is 8/4 bits

N:number of line is 2/1

F:font size is 5x11/5x8

37 us

Set CGRAM

address

AC5

AC4

AC3

AC2

AC1

AC0

Set CGRAM address in

address counter

37 us

Set DDRAM

address

AC6

AC5

AC4

AC3

AC2

AC1

AC0

Set DDRAM address in

address counter

37 us

Read Busy

flag and

address

AC6

AC5

AC4

AC3

AC2

AC1

AC0

Whether during internal

operation or not can be

known by reading BF. The

contents of address counter

can also be read.

0 us

Write data

to RAM

Write data into internal

RAM

(DDRAM/CGRAM)

37 us

Read data

from RAM

Read data from internal

RAM

(DDRAM/CGRAM)

37 us

Note:

Be sure the ST7066U is not in the busy state (BF = 0) before sending an instruction from the MPU to the

ST7066U. If an instruction is sent without checking the busy flag, the time between the first instruction and next

instruction will take much longer than the instruction time itself. Refer to Instruction Table for the list of each

instruction execution time.

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