HD44780U Datasheet, PDF (59/59 Pages) Hitachi Semiconductor – Dot Matrix Liquid Crystal Display Controller/Driver

HD44780U
CL1
CL2
VOH2
VOH2
t_CWH
t_CSU
t_ct
VOL2
t_CWH
VOL2
t_CSU
VOH2
t_CWL
t_ct
D
VOH2
VOL2
t_DH
t_SU
M
VOH2
t _DM
Figure 27 Interface Timing with External Driver
V_CC
2.7 V/4.5 V*²
0.2 V
0.2 V
0.2 V
t_rcc
0.1 ms ≤ t_rcc ≤ 10 ms
t_OFF*1
t_OFF ≥ 1 ms
Notes: 1. t_OFF compensates for the power oscillation period caused by momentary power supply
oscillations.
2. Specified at 4.5 V for 5-V operation, and at 2.7 V for 3-V operation.
3. 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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