Motorola M68CPU32BUG Manuel d'utilisateur télécharger pdf (Page 34)

The

Extended Concise

LCD Data Sheet

for HD44780

Version: 25.6.1999

Instruction RS

RW

D7 D6 D5 D4 D3 D2 D1 D0 Description

Clock-

Cycles

NOP 0 0 0 0 0 0 0 0 0 0

No Operation 0

Clear Display 0 0 0 0 0 0 0 0 0 1

Clear display & set address counter to zero 165

Cursor Home 0 0 0 0 0 0 0 0 1 x

Set adress counter to zero, return shifted

display to original position.

DD RAM contents remains unchanged.

3

Entry Mode

Set

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

Set cursor move direction (I/D) and specify

automatic display shift (S).

3

Display

Control

0 0 0 0 0 0 1 D C B

Turn display (D), cursor on/off (C), and

cursor blinking (B).

3

Cursor /

Display shift

0 0 0 0 0 1 S/C R/L x x

Shift display or move cursor (S/C) and

specify direction (R/L).

3

Function Set 0 0 0 0 1 DL N F x x

Set interface data width (DL), number of

display lines (N) and character font (F).

3

Set CGRAM

Address

0 0 0 1 CGRAM Address

Set CGRAM address. CGRAM data is sent

afterwards.

3

Set DDRAM

Address

0 0 1 DDRAM Address

Set DDRAM address. DDRAM data is sent

afterwards.

3

Busy Flag &

Address

0 1 BF Address Counter

Read busy flag (BF) and address counter 0

Write Data 1 0 Data

Write data into DDRAM or CGRAM 3

Read Data 1 1 Data

Read data from DDRAM or CGRAM 3

I/D

1

0

Increment

Decrement

R/L

1

0

Shift to the right

Shift to the left

S

1

0

Automatic display shift

DL

1

0

8 bit interface

4 bit interface

D

1

0

Display ON

Display OFF

N

1

0

2 lines

1 line

C

1

0

Cursor ON

Cursor OFF

F

1

0

5x10 dots

5x7 dots

B

1

0

Cursor blinking

x : Don't care

S/C

1

0

Display shift

Cursor move

DDRAM : Display Data RAM

CGRAM : Character Generator RAM

LCD Display with 2 lines x 40 characters :

LCD Display with 2 lines x 16 characters :

Pin No Name Function Description

1 Vss Power GND

2 Vdd Power + 5 V

3 Vee Contrast Adj. (-2) 0 - 5 V

4 RS Command Register Select

5 R/W Command Read / Write

6 E Command Enable (Strobe)

7 D0 I/O Data LSB

8 D1 I/O Data

9 D2 I/O Data

10 D3 I/O Data

11 D4 I/O Data

12 D5 I/O Data

13 D6 I/O Data

14 D7 I/O Data MSB

1 2 ... 29 30 31 32 33 34 35

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