1
3
P
P
L
P
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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
RS
0
display control
RS
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
entry mode set
RS
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
write data to CGRAM or DDRAM
RS
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
1
0
1
1
0
sets to 8-bit operation; selects 2
×
24 display
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
1
1
1
0
0
0
3
turns display and cursor on; entire display is blank after
initialization
0
1
1
1
0
4
_
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
0
0
1
1
0
5
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
1
0
0
0
0
6
|
|
|
7
write data to CGRAM or DDRAM
RS
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
1
0
1
1
0
set DDRAM address
RS
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
_
0
0
1
1
0
write data to CGRAM or DDRAM
RS
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
M_
1
0
1
1
0
PHILIPS_
writes ‘S’
1
0
0
1
1
8
PHILIPS
sets DDRAM address to position the cursor at the head of the
2nd line
0
0
0
0
0
9
PHILIPS
writes ‘M’
0
1
1
0
1
10
|
|
|
11
write data to CGRAM or DDRAM
RS
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
MICROCO_
1
0
1
1
0
0
PHILIPS
writes ‘O’
1
1
1
1