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HD44780U Datasheet(PDF) 71 Page - Hitachi Semiconductor

Part # HD44780U
Description  Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function
Download  97 Pages
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Manufacturer  HITACHI [Hitachi Semiconductor]
Direct Link  http://www.renesas.com/eng
Logo HITACHI - Hitachi Semiconductor

HD44780U Datasheet(HTML) 71 Page - Hitachi Semiconductor

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Table 34
Correspondence between Annunciator Display Addresses (AAN) and Driver Signals
AAN Address
Segment Signal
MSB
LSB
Common Signal
Bits 7, 6
Bits 5, 4
Bits 3, 2
Bits 1, 0
0
0
0
0
ACOM
ASEG1
ASEG2
ASEG3
ASEG4
0
0
0
1
ACOM
ASEG5
ASEG6
ASEG7
ASEG8
0
0
1
0
ACOM
ASEG9
ASEG10
ASEG11
ASEG12
Note:
The annunciator is turned on when the corresponding even bit (bit 6, 4, 2, or 0) is 1, and the turned-
on annunciator blinks when the corresponding odd bit (bit 7, 5, 3, or 1) is 1.
i) Normal mode and sleep mode
ii) Standby mode (without oscillation)
VCC level
VCC level
VCC level
AGND level
AGND level
AGND level
AGND level
AGND level
VCC level
VCC level
VCC level
VCC level
Display off
Display on
1 frame
ACOM
ASEG1
ASEG2
EXM
(Input)
VCC level
VCC level
VCC level
AGND level
AGND level
AGND level
VCC level
VCC level
VCC level
ACOM
ASEG1
ASEG2
Display off
Display on
1 frame
Note: If annunciator display is unnecessary during standby mode, make sure to fix the EXM pin to the VCC or GND level
and set the annunciator display ON bit (DA) to 0. This will prevent dark display and liquid-cell deterioration due to
DC bias application on liquid crystal cells.
Figure 40 Annunciator Drive Output Waveforms


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