PIC14000 datasheet(44/153 Pages) MICROCHIP

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PIC14000

DS40122B-page 44

Preliminary

TABLE 7-1:

I2C BUS TERMINOLOGY

Term

Description

Transmitter

The device that sends the data to the bus.

Receiver

The device that receives the data from the bus.

Master

The device which initiates the transfer, generates the clock, and terminates the transfer.

Slave

The device addressed by a master.

Multi-master

More than one master device in a system. These masters can attempt to control the bus

at the same time without corrupting the message.

Arbitration

Procedure that ensures that only one of the master devices will control the bus. This

ensures that the transfer data does not get corrupted.

Synchronization

Procedure where the clock signals of two or more devices are synchronized.

FIGURE 7-4:

I2C 7-BIT ADDRESS FORMAT

FIGURE 7-5:

I2C 10-BIT ADDRESS

FORMAT

R/W ACK

Sent by

Slave

slave address

R/W

Read/Write pulse

MSb

LSb

Start Condition

ACK

Acknowledge

sent by slave

= 0 for write

R/W

ACK

11 1 0 A9 A8 RW ACK A7 A6 A5 A4 A3 A2 A1 A0 ACK

Start Condition

Read/Write Pulse

Acknowledge

7.2

Addressing I2C Devices

There are two address formats. The simplest is the

7-bit address format with a R/W bit (Figure 7-4). The

address is the most signiﬁcant seven bits of the byte.

For example when loading the I2CADD register, the

least signiﬁcant bit is a “don’t care”. The more complex

is the 10-bit address with a R/W bit (Figure 7-5). For

10-bit address format, two bytes must be transmitted

with the ﬁrst ﬁve bits specifying this to be a 10-bit

address.

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