BU97941FV_15 Datasheet, PDF (7/27 Pages) Rohm – Multifunction LCD Segment Driver

BU97941FV MAX 104 segments (SEG26×COM4)
Writing to RAM is done per 4bit. When CSB is set to „H‟ and the data is less than 4 bits, the writing of RAM will be
cancelled. （Transfer of command is done per 8bit.）
1st byte Command / 2nd byte Command
Command
CSB
Display data
SCL
SD
Internal Signal
RAM write
Address Set Command
RAM WRITE Command D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
Address 00h
Address 01h
RAM write per 4bit
Address 02h
When CSB='H' is set and
less than 4bit, writing
is cancelled.
1st byte Command / 2nd byte Command
Command
CSB
Display data
SCL
SD
Internal Signal
RAM write
Address Set Command
RAM WRITE Command D7 D6 D5 D4 D3 D2 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4
Address 00h
Address 30h
Address 31h
Address 00h
Returns to 0 through
auto increment
Figure 8. Display Data Transfer Method
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