ST7920
4-bit interface:
POWER ON
Wait time > 40mS
(for VDD stable)
XRESET: LOW
HIGH
Function set
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
0
1
0
X
X
X
X
X
X
X
X
X
X
X
Wait time > 100μS
Function set
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
0
1
0
X
X
X
X
X
X
X
X
X
X
X
Wait time > 100μS
Display ON/OFF Control
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
1
0
0
0
X
X
X
X
X
X
X
X
D
C
B
Wait time > 100μS
Display Clear
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
0
0
0
0
0
1
X
X
X
X
X
X
X
X
Wait time > 10mS
Entry Mode Set
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
0
1
0
0
X
X
X
X
X
X
X
X
I/D
S
INITIALIZATION END
V4.0
35/49
2008/08/18
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
