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Table 8

Example of 8-bit operation; 2-line display; using internal reset

STEP

INSTRUCTION

DISPLAY

OPERATION

1

power supply on (PCF2105 is initialized by the internal reset

function)

initialized; no display appears

2

function set

sets to 8-bit operation; selects 2

× 24 display

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

0000111000

3

display control

turns display and cursor on; entire display is blank after

initialization

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

0000001110

4

entry mode set

_

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

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

display is not shifted

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

0000000110

5

write data to CGRAM or DDRAM

P_

writes ‘P’; the DDRAM has already been selected by

initialization at power-on; the cursor is incremented by 1 and

shifted to the right

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

1011010000

6

|

|

|

7

write data to CGRAM or DDRAM

PHILIPS_

writes ‘S’

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

1011010011

8

set DDRAM address

PHILIPS

sets DDRAM address to position the cursor at the head of the

2nd line

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 _

0011000000

9

write data to CGRAM or DDRAM

PHILIPS

writes ‘M’

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 M_

1011001101

10

|

|

|

11

write data to CGRAM or DDRAM

PHILIPS

writes ‘O’

RS

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 MICROCO_

1011001111