LG KP500 Service Manual page 45

3. TECHNICAL BRIEF
The SC654 is a write-only single wire interface. It provides access to up to 32 registers that control
device functionality.In this system, two sets of pulse trains are transmitted via the SPIF pin. The first
pulse set is used to set the desired address. After the bus is held high for the address hold period, the
next pulse set is used to write the data value. After the data pulses are transmitted the bus is held high
again for the data hold period to signify the data write is complete. At this point the slave device
latches the data into the address that was selected by the first set of pulses. The protocol for using this
interface is described in the following subsection.
LGE Internal Use Only
Figure 13 I2C Serial data port control method
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