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HD44780 Datasheet(PDF) 59 Page - Hitachi Semiconductor

Part No. HD44780
Description  Dot Matrix Liquid Crystal Display Controller/Driver
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Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng
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 59 page
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HD44780U
59
CL1
CL2
D
M
VOH2
VOH2
VOL2
tct
tCWH
tCWH
tCSU
VOH2
tCSU
tCWL
tct
tDH
tSU
VOH2
tDM
VOH2
VOL2
VOL2
Figure 27 Interface Timing with External Driver
VCC
0.2 V
2.7 V/4.5 V*2
0.2 V
0.2 V
trcc
tOFF*1
0.1 ms
trcc 10 ms
tOFF
1 ms
Notes: 1.
2.
3.
tOFF compensates for the power oscillation period caused by momentary power supply
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.)
Figure 28 Internal Power Supply Reset




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