HD44780 Hitachi Semiconductor (acquired by Renesas), HD44780 Datasheet - Page 59

• Manufacturer Part Number: HD44780
• Description: Dot Matrix Liquid Crystal Display Controller/driver
• Manufacturer: Hitachi Semiconductor (acquired by Renesas)

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
2.7 V/4.5 V*
compensates for the power oscillation period caused by momentary power supply
0.2 V
Figure 27 Interface Timing with External Driver
t
0.1 ms
rcc
VOL2
2
Figure 28 Internal Power Supply Reset
VOH2
t
rcc
t
t
CSU
CSU
10 ms
t
VOH2
CWH
VOH2
t
CWH
VOL2
VOH2
t
ct
t
0.2 V
DM
t
t
CWL
SU
t
OFF
t
ct
t
OFF
t
DH
*1
1 ms
VOH2
VOL2
0.2 V
HD44780U
59