MIC33M656 datasheet(27/46 Pages) MICROCHIP

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DS20006256A-page 27

MIC33M656

6.5.2

SINGLE READ

This reads a single byte from a device, from a

designated register. The register is specified through

the command byte.

The Read command is as follows and it is illustrated in

the timing diagram of Figure 6-4 below.

Send Start sequence.

Send 7-bit slave address.

Send the R/W bit – ‘0’ to indicate a write operation.

Wait for Acknowledge from the slave.

Send the register address that needs to be read.

Wait for Acknowledge from the slave.

Send Start sequence again (Repeated Start

condition).

Send the 7-bit slave address.

Send R/W bit – ‘1’ to indicate a read operation.

10. Wait for Acknowledge from the slave.

11. Receive the 8-bit data from the slave starting

from MSB.

12. Acknowledge from the master. On the received

byte, the master receiver issues a NACK in

place of an ACK to signal the end of the data

transfer.

13. Send Stop sequence.

FIGURE 6-4:

Single Read Timing Diagram.

Note:

Attempts to read from a non-existing

SDA

START

condition

ACK from Slave

Slave address

Command byte

ACK from

Slave

(repeated)

START condition

R/W

ACK from Slave

Slave address

Data from register

STOP

condition

DATA (first byte)

R/W

At this moment master-transmitter becomes master-receiver

and slave-receiver becomes slave-transmitter

(cont.)

* * *

(cont.)

* * *

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