Rainbow Electronics HD44780 - Manual (Page 58)

HD44780U
58
Timing Characteristics
RS
R/W
E
DB0 to DB7
VIH1
VIL1 VIH1
VIL1
t
AS
t
AH
VIL1 VIL1
t
AH
PW
EH
t
Ef
VIH1
VIL1 VIH1
VIL1
t
Er
t
DSW
t
H
VIH1
VIL1 VIH1
VIL1
t
cycE
VIL1
Valid data
Figure 25 Write Operation
RS
R/W
E
DB0 to DB7
VIH1
VIL1 VIH1
VIL1
t
AS
t
AH
VIH1 VIH1
t
AH
PW
EH
t
Ef
VIH1
VIL1 VIH1
VIL1
t
DDR
t
DHR
t
Er
VIL1
VOH1
VOL1 * VOH1
* VOL1
Valid data
t
cycE
Note: * VOL1 is assumed to be 0.8 V at 2 MHz operation.
Figure 26 Read Operation