HD44780U Datasheet, PDF (46/59 Pages) Hitachi Semiconductor – Dot Matrix Liquid Crystal Display Controller/Driver

HD44780U
Power on
Wait for more than 15 ms
after V_CC rises to 4.5 V
RS R/W DB7 DB6 DB5 DB4
000011
Wait for more than 40 ms
after V_CC rises to 2.7 V
BF cannot be checked before this instruction.
Function set (Interface is 8 bits long.)
Wait for more than 4.1 ms
RS R/W DB7 DB6 DB5 DB4
000011
Wait for more than 100 µs
BF cannot be checked before this instruction.
Function set (Interface is 8 bits long.)
RS R/W DB7 DB6 DB5 DB4
000011
BF cannot be checked before this instruction.
Function set (Interface is 8 bits long.)
RS R/W DB7 DB6 DB5 DB4
000010
000010
0 0NF * *
000000
001000
000000
000001
000000
0 0 0 1 I/D S
Initialization ends
BF can be checked after the following instructions.
When BF is not checked, the waiting time between
instructions is longer than the execution instuction
time. (See Table 6.)
Function set (Set interface to be 4 bits long.)
Interface is 8 bits in length.
Function set (Interface is 4 bits long. Specify the
number of display lines and character font.)
The number of display lines and character font
cannot be changed after this point.
Display off
Display clear
Entry mode set
Figure 24 4-Bit Interface
46