MIC24045 datasheet(37/46 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS20005568A-page 37

MIC24045

8.5.3

SINGLE READ

This reads a single byte from a device, from a desig-

nated 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 8-5 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 ACK to signal the end of the data

transfer.

13. Send STOP sequence

FIGURE 8-5:

Single Read Timing Diagram.

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.)

* * *

Note:

Attempts to read from a non-existing

action (NACK) by the MIC24045 after the

command byte.

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