BU9910KV Datasheet, PDF (11/15 Pages) Rohm – Status display LCD driver for PCs with I2C Bus interface

Multimedia ICs
BU9910KV
D3 to D0: Pointer register
The Pointer register appoints a base address, which acceses the LCD display memory in read or write mode.
In the write mode, a byte data that follows command byte is written to the LCD display memory which is
appointed by the pointer register.
Write address is incremented automatically and more than 2 bytes data are written to continuous place that
starts from the base address.
A master controller can continue to access the LCD display memory untill it generates the stop condition.
In the read mode, the master reads the LCD display memory data that is appointed by the pointer register.
Read adress is incremented automatically and the master read the LCD display memory data of continuous
address that starts from the base address.
The master can continue to access the LCD display memory data until it generates the NO ACK & Stop
Condition.
The pointer register value should be 0000b(0h) to 1011b(Bh) and becomes 0h after Bh.
Do not set Ch, Dh, Eh, Fh to the pointer register.
2) LCD display memory
LCD driving condition
Segment data memory Blink control memory
0
0
0
1
1
0
1
1
Driving condition
Off
Off
Light
Blink
Segment data memory: SEG vs. COM(COM No. / SEG No.)
Base address
bit7
bit6
bit5
bit4
0000b
3/1
2/1
1/1
0/1
0001b
3/3
2/3
1/3
0/3
0010b
3/5
2/5
1/5
0/5
0011b
3/7
2/7
1/7
0/7
0100b
3/9
2/9
1/9
0/9
0101b
0
0
0
0
bit3
3/0
3/2
3/4
3/6
3/8
3 / 10
bit2
2/0
2/2
2/4
2/6
2/8
2 / 10
bit1
1/0
1/2
1/4
1/6
1/8
1 / 10
bit0
0/0
0/2
0/4
0/6
0/8
0 / 10
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