HD44780U Hitachi Semiconductor (acquired by Renesas), HD44780U Datasheet - Page 60

• Manufacturer Part Number: HD44780U
• Description: Dot Matrix Liquid Crystal Display Controller/driver
• Manufacturer: Hitachi Semiconductor (acquired by Renesas)

HD44780U
226
Notes: 1.
CL1
CL2
D
M
V
CC
2.
3.
t
oscillations.
Specified at 4.5 V for 5-V operation, and at 2.7 V for 3-V operation.
For if 4.5 V is not reached during 5-V operation, the internal reset circuit will not operate
normally.
In this case, the LSI must be initialized by software. (Refer to the Initializing by
Instruction section.)
OFF
Figure 29 Interface Timing with External Driver
2.7 V/4.5 V*
compensates for the power oscillation period caused by momentary power supply
0.2 V
Figure 30 Internal Power Supply Reset
t
0.1 ms
rcc
VOL2
2
VOH2
t
rcc
t
t
CSU
CSU
10 ms
t
VOH2
CWH
t
VOH2
CWH
VOL2
VOH2
t
ct
t
0.2 V
DM
t
CWL
t
SU
t
OFF
t
ct
t
OFF
t
DH
*1
1 ms
VOH2
VOL2
0.2 V