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4-BIT INTERFACE
The following procedures are followed during the initialization of a 4-bit MPU
Power ON
WAIT FOR MORE THAN
15ms AFTER
THE VDD RISES TO 4.5V
RS
R/W
DB7
DB6
DB5
DB4
BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION.
0
0
0
0
1
1
FUNCTION SET (INTERFACE IS 8 BITS LONG.)
WAIT FOR MORE THAN 4.1ms
RS
R/W
DB7
DB6
DB5
DB4
BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION.
0
0
0
0
1
1
FUNCTION SET (INTERFACE IS 8 BITS LONG.)
WAIT FOR MORE THAN 100 us
RS
R/W
DB7
DB6
DB5
DB4
BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION.
0
0
0
0
1
1
FUNCTION SET (INTERFACE IS 8 BITS LONG.)
RS
R/W
DB7
DB6
DB5
DB4
BF CAN BE CHECKED AFTER THE FOLLOWING INSTRUCTIONS.
0
0
0
0
1
0
WHEN THE BF IS NOT CHECKED, THE WAITING TIME BETWEEN
0
0
0
0
1
0
THE INSTRUCTIONS IS LONGER THAN THE TIME IT TAKES FOR
0
0
N
F
*
*
THE INSTRUCTION TO BE EXECUTED.
0
0
0
0
0
0
FUNCTION SET (SET INTERFACE IS 4 BIT LONG)
0
0
1
0
0
0
INTERFACE IS 8 BITS LONG
0
0
0
0
0
0
FUNCTION SET (INTERFACE IS 4 BIT LONG. SPECIFY THE
0
0
0
0
0
1
NUMBEROF DISPLAY LINES AND CHARACTER FONT).
0
0
0
0
0
0
THE NUMBER OF DISPLAY LINES AND CHARACTER FONT
0
0
0
1
I/D
S
CANNOT BE CHANGED AFTER THIS POINT.
DISPLAY OFF
DISPLAY CLEAR
END OF INITIALIZATION
END OF INITIALIZATION ENTRY MODE SET
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