BU9729K Datasheet, PDF (6/12 Pages) Rohm – Segment-type LCD driver

Standard ICs
•^{Timing charts}
CS
SCK
SD
C/D
tWL2
tSU2
tCYC
tWH1
tWL1
tSU1
tTLH1
tH1
tTHL
tSCH
tSU3
Fig. 2 Interface timing
tCYC
SCK
tWH2
tH2
BU9729K
tCCH
tH3
tWA / T
SD
D7
D6
D0
D7
Fig. 3 Command cycle
•^{Data format}
Serial data is transmitted using four-line clock synchronous transmission. Serial data with a length of eight bits is
input synchronized to SCK. If C / D is HIGH at the rise of the 8 × nth clock of SCK, the serial data is recognized as a
command, and if C / D is LOW, the serial data is recognized as display data.
Serial data is input sequentially, starting from the MSB.
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