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STEP

INSTRUCTION

DISPLAY

OPERATION

initialized; no display appears

2

slave address for write

SA6 SA5 SA4 SA3 SA2 SA1 SA0 R/W

Ack

during the acknowledge cycle SDA will be pulled-down by the

PCF2103

011101001

3

send a control byte for ‘function set’

Co

RS

0

0

0

0

0

0

Ack

control byte sets RS for following data bytes

000000001

4

function set

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Ack

selects 1-line display; SCL pulse during acknowledge cycle

starts execution of instruction

0

0

1X0

0

0

0

1

5

display on/off control

_

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Ack

turns on display and cursor; entire display shows character 20H

(blank in ASCII-like character sets)

000011101

6

entry mode set

_

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Ack

sets mode to increment the address by 1 and to shift the cursor

to the right at the time of write to the DDRAM or CGRAM; display

is not shifted

000001101

_

for writing data to DDRAM, RS must be set to 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

0

0

0

0

0

0

Ack

010000001

10

‘write data’ to DDRAM

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Ack

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

cursor is incremented by 1 and shifted to the right

010100001

P_