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Dot-Matrix LCD Units
4-Bit Interface
Power ON
Wait 15 ms or more
after V
reaches 4.5 V
DD
RS R/W DB
DB
7
6
0
0
0
0
Wait 4.1 ms or more
RS R/W DB
DB
7
6
0
0
0
0
Wait 100 µs or more
RS R/W DB
DB
7
6
0
0
0
0
RS R/W DB
DB
7
6
0
0
0
0
0
0
0
0
0
0
N
F
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
End of Initialization
14
DB
DB
5
4
1
1
DB
DB
5
4
1
1
DB
DB
5
4
1
1
(a) Busy flag can be checked after the following instructions
are completed. If the busy flag is not going to be checked,
then a wait time longer than the total execution time of
these instructions is required (See Table 7.)
DB
DB
5
4
I
I Function Set (4-Bit Interface)
1
0
This instruction signals the LCD unit to begin accepting and
1
0
sending data in dual 4-bit transfers for all subsequent
II
transfers for all subsequent transactions. This is the only
*
*
4-bit instruction recognized by the LCD unit.
0
0
III
0
0
II Function Set
0
O
III Display Off
IV
0
1
IV Display Clear
0
0
V Entry Mode Set
V
I/D
S
Figure 4. 4-Bit Interface
Busy flag can't be checked before execution of this
instruction
Function Set (8-Bit Interface)
Busy flag can't be checked before execution of this
instruction
Function Set (8-Bit Interface)
Busy flag can't be checked before execution of this
instruction
Function Set (8-Bit Interface)
4-Bit Interface,
Single/Dual Line
Display, Display Font
Caution: At this point,
the display format
can't be changed.
LCD21-11
Display Unit User's Manual
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