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_

for writing data to DDRAM, RS must be set to logic 1; therefore

a control byte is needed

8

slave address for write

_

SA6

SA5

SA4

SA3

SA2

SA1

SA0

R/W

Ack

011101001

9

send a control byte for write data

_

Co

RS

R/W

Ack

0101

10

write data to DDRAM

P_

writes ‘P’; the DDRAM has been selected at power-up;

the cursor is incremented by 1 and shifted to the right

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Ack

110100001

11

write data to DDRAM

PH_

writes ‘H’

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Ack

110010001

12

to

15

|

|

|

|

16

write data to DDRAM

PHILIPS_

writes ‘S’

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Ack

110100111

17

write (as step 8)

PHILIPS_

18

control byte

PHILIPS_

Co

RS

R/W

Ack

1001

19

return home

PHILIPS

sets DDRAM address 0 in AC; also returns shifted display to

original position; DDRAM contents unchanged; this instruction

does not update the DR

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Ack

000000101

20

control byte for read

PHILIPS

DDRAM content will be read from following instructions;

Co

RS

R/W

Ack

0111

21

PHILIPS

STEP

INSTRUCTION

DISPLAY

OPERATION