STE12PS datasheet(28/44 Pages) STMICROELECTRONICS

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I2C slave protocol overview

STE12PS

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5.5

I2C write command format is shown in

Figure 14.

Write command

The formatting bits shown in

Figure 14 are defined as follows:

●

S - I2C start condition

●

P - I2C stop condition

●

ACK – acknowledge

●

NACK - not acknowledge

●

R/W - read/write

The device address is the value specified in I2C device address. The register address is an

eight-bit value that is written into an internal Index Register. Each time a byte of data is

written to, or read from the POE controller, the Index Register increments by one.

If the initial value written to the Index Register is K, then the byte immediately following the

to the register with the address of K+1, and so on.

An I2C write command can contain from 0 to 255 write data bytes. Write commands to an

unknown register location are ignored by the interface.

As shown in

Figure 14, bits are ordered with the most significant bit first.

Device address

6543210

Write data

Write data (K + 1)

6543210

Write data (K + N)

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