HD44780 datasheet(59/59 Pages) HITACHI

部品番号	HD44780

部品情報	Dot Matrix Liquid Crystal Display Controller/Driver

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メーカー	HITACHI [Hitachi Semiconductor]

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59 / 59 page

HD44780U

59

CL1

CL2

D

M

VOH2

VOL2

tct

tCWH

tCSU

VOH2

tCSU

tCWL

tct

tDH

tSU

VOH2

tDM

VOH2

VOL2

Figure 27 Interface Timing with External Driver

VCC

0.2 V

2.7 V/4.5 V*2

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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