I2c bus

• Serial bus.
• Originally proposed by Philips
• 400KHz - Slow
• 8 or 16 bits.

• I2c protocol

It uses only 2 signals (wires) Clock & Data.

The following protocol is implemented between master (CPU) and Slave devices.

START

C: H

D: Fall

STOP

C: H

D: Rise

ACK

C: H

D[9] = H or L

Send Address + D[0]command(Read)

Get ACK

Get Data

Send Address + D[0]command(Write)

Get ACK

Send Data