BU9728AKV Datasheet, PDF (6/10 Pages) Rohm – LCD driver for segment-type LCDs

Standard ICs
BU9728AKV
•^{A detailed look at commands}
The BU9728AKV has the following commands (C / D is HIGH at 8 × nth clock pulse of SCK).
(1) Address Set
MSB
LSB
0
0
0
A
A
A
A
A
AAAAA and the address data displayed in binary format are set in the address counter. Each time input of the
display data (8 bits) has been completed, the address is incremented by + 2.
(2) Display On
MSB
LSB
0
0
1
∗∗∗∗∗
∗ Irrelevant
All display segments light, regardless of the contents of the Display Data RAM (DDRAM). The contents of the
DDRAM do not change.
(3) Display Off
MSB
LSB
0
1
0
∗∗∗∗∗
∗ Irrelevant
All display segments go out, regardless of the contents of the DDRAM. The contents of the DDRAM do not
change.
(4) Display Start
MSB
LSB
0
1
1
∗∗∗∗∗
∗ Irrelevant
Display begins, in accordance with the contents of the DDRAM.
(5) Rewrite Display Data RAM (DDRAM)
MSB
LSB
1
0
0
∗
D
D
D
D
∗ Irrelevant
The binary bit data DDDD is written to the DDRAM. The data is written to the address specified by the Address
Set command, and after this command is executed, the address is automatically incremented by + 1.
(6) Reset
MSB
LSB
1
1
0
∗∗∗∗∗
∗ Irrelevant
This command should be executed before any other command, immediately after the power supply is turned on.
This command resets the BU9728AKV to the following status:
• Display is off
• Address counter is reset
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