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%()BC D): 0)8 * / / * ;)1 , >E1 , 8 * . F5 - 1 * ,1 ,G1 > 3 . 0EH C HE1 2+- 5 6 0 ,8 . * F- : 04 5 - 5E2 : 0 0 -!* 8=I!JLK KM N OJP Q=RTS Q U V WX+YJ!Z [ [

Y+P \ Q U P ] ] ^ UE_`JEU V a ^ U!Xb [ C

0 0 0 0 0 0 0 0 1 *

0 0 0 1

CGA

DDA

CGA

DDA

40us x250270

RS R/W DB DB DB DB DB DB DB DB7 6 5 4 2 1 03Description

Clears all display and returnsthe cursor to the home position(Address 0).

fosc is 250 kHz)

Execution Time

Returns the cursor to the homeposition (Address 0). Also returnsthe display being shifted to theoriginal position. DD RAMcontents remain unchanged.

0 0 0 0 0 0 0 S1 I/D

Set the cursor move directionand specifies or not to shift thedisplay. These operations areperformed during data write andread.Sets ON/OFF of all display (D),cursor ON/OFF (C), and blink ofcursor position character (B).

Clear Display

Return Home

Entry ModeSet

Display ON/OFF control

0 0 0 0 0 0 BCD1

0 0 0 0 0 0 0 0 0 1

Moves the cursor and shifts thedisplay without changing DDRAM contents.

0 0 0 0 0 **1 S/C R/L

Sets interface data length (DL),number of display lines(L) andcharacter font (F).

0 **FNDL

Cursor orDisplay Shift

Function Set

Set CG RAMAddress

Set DD RAMAddress

Sets the CG RAM address. CGRAM data is sent and receivedafter this setting.Sets the DD RAM address. DDRAM data is sent and receivedafter this setting.Reads Busy flag (BF) indicatinginternal operation is beingperformed and reads addresscounter contents.

Read BusyFlag &Address

0 0 0 1

0

0 0 1

1 BF

Write Datato CG or DD

DD RAM

Read Datafrom CG or

Write data into DD RAM or

Read data from DD RAM orCG RAM.

CG RAM.RAM

1.64 ms

1.64 ms

40 us

40 us

40 us

40 us

40 us

40 us

40 us

40 us

0 us

1 0

1 1

Write Data

Read Data

AC

Instruction Word for the LCD Controller & Driver (Hitachis HD44780)

S/C = 1: Display shift

I/D = 1: IncrementI/D = 0: Decrement

S = 1: Accompanies display shift

S/C = 0: Cursor moveR/L = 1: Shifts to the rightR/L = 0: Shifts to the left

N = 1: 2 lines, N = 0: 1 line

BF = 1: Internally operatingBF = 0: Can accept instruction

F = 1: 5x10 dots, F = 0: 5x7 dots

DL = 1: 8 bits, DL = 0: 4 bits

DD RAM: Display data RAMCG RAM: Character generator

RAM

AC: Address counter used forboth of DD and CG RAMaddress

: CG RAM address

: DD RAM addressCoresponds to cursoraddress.

Execution timechanges whenfrequencychanges.

= 37 us

fosc is 270 kHz:When fcp or(Example)

InstructionCode

* Dont Care

(when fcp or

G1 > 3 . 0H C H c& 3 FF5 . d* 8=(+* FF5 ,?4 28 * .+- : 0e!B!f f g h iE- d A?0(+* , - . * / / 0 .

H h