BU91R63CH-M3BW Datasheet, PDF (11/37 Pages) Rohm – Low Duty LCD Segment Driver

BU91R63CH-M3BW Max 176 segments (SEG44 x COM4)
Read Display and Transfer Method
For Read Mode set R/W bit to ‘1’.
The display data and command register value can be read during Read Mode.
The Read Mode sequence is shown below.
Slave address
Command
Command
Slave address
S 0111110 0 A 1 1101000 A 1 0000000 A S 0111110 1 A
Data A …...
R/W(Write Mode)
R/W(Read Mode)
Data A P
During Read Mode, the display data can be read from the DDRAM through the SDA line.
The data will output synchronously to SCL clock input.
First set address by Write Mode ADSET command to read display data.
If DDRAM address is not specified before DDRAM read, the read address will start from the current DDRAM
address.
Address will increment automatically by +2 addresses after 8bit data output.
Master side should output ACK signal after each 8bit data output.
BU91R63CH-M3BW is kept at Read Mode and address increment after receiving ACK signal from master side.
If there is no ACK response, BU91R63CH-M3BW will not keep above read operation, transmit “STOP
condition”.
Read Mode will be stopped by sending “STOP condition”.
Address will be set to 00h automatically after 2Bh. (It does not increment to 2Ch or 2Dh address)
Shown below is an example of the display data read sequence.
S
SDA
SCL
Slave Address (read)
P
A D7 D6 D5 D4 D3 D2 D1 D0 A D7 D6 D5 D4 D3 D2 D1 D0 A
Figure 9. Read Sequence
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10 Feb. 2016 Rev.001